<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                    FORM 10-Q
(Mark One)
    [X]  Quarterly Report Pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934

                      FOR THE QUARTER ENDED MARCH 31, 1999

    [ ]  Transition report pursuant to Section 13 or 15(d) of
         the Securities Exchange Act of 1934 For the Period From _________ to
         __________.
         
                        Commission File Number: 001-14593
                          THE MIIX GROUP, INCORPORATED
             (Exact name of Registrant as specified in its charter)

<TABLE>
<CAPTION>
                    DELAWARE                                                   22-3586492
<S>                                                             <C>
(State or other jurisdiction of incorporation or                (I.R.S. employer identification number)
                 organization)
</TABLE>

               TWO PRINCESS ROAD, LAWRENCEVILLE, NEW JERSEY 08648
              (Address of principal executive offices and zip code)

                                 (609) 896-2404
              (Registrant's telephone number, including area code)

           Securities registered pursuant to Section 12(b) of the Act:
                     Common Stock, par value $.01 per share
        Securities registered pursuant to Section 12(g) of the Act: None

         Indicate by check mark whether the Registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter periods as the
Registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.
                                    YES X NO

         No securities are held by non-affiliates of the Registrant.

         As of May 17, 1999, the number of outstanding shares of the
Registrant's Common Stock was 10.
<PAGE>   2
TABLE OF CONTENTS
-----------------

<TABLE>
<CAPTION>

<S>            <C>                                                               <C>
PART I         FINANCIAL INFORMATION..........................................    4
                                                                               
                                                                               
ITEM 1.        CONSOLIDATED FINANCIAL STATEMENTS..............................    4
                                                                               
ITEM 2.        MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL               
                     CONDITION AND RESULTS OF OPERATIONS......................   10
                                                                               
ITEM 3.        QUANTITATIVE AND QUALITATIVE DISCLOSURES                        
                    ABOUT MARKET RISK.........................................   18
                                                                               
PART II        OTHER INFORMATION..............................................   19
                                                                               
                                                                               
ITEM 1.        LEGAL PROCEEDINGS..............................................   19
                                                                               
ITEM 2.        CHANGES IN SECURITIES AND USE OF PROCEEDS......................   20
                                                                               
ITEM 3.        DEFAULTS UPON SENIOR SECURITIES................................   20
                                                                               
ITEM 4.        SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS............   20
                                                                               
ITEM 5.        OTHER INFORMATION..............................................   20
                                                                               
ITEM 6.        EXHIBITS AND REPORTS ON FORM 8-K...............................   20
                                                                               
                                                                               
SIGNATURES     ...............................................................   21
</TABLE>
<PAGE>   3
The Private Securities Litigation Reform Act of 1995 provides a "safe harbor"
for forward-looking statements. This Form 10-Q, the Company's Annual Report to
Stockholders, any Form 10-K or any Form 8-K of the Company or any other written
or oral statements made by or on behalf of the Company may include
forward-looking statements which reflect the Company's current views with
respect to future events and financial performance. These forward-looking
statements are subject to uncertainties and other factors that could cause
actual results to differ materially from such statements. These uncertainties
and other factors (which are described in more detail elsewhere in this Form
10-Q) include, but are not limited to: (i) the Company having sufficient
liquidity and working capital; (ii) the Company's strategy to seek consistent
profitable growth; (iii) the Company's ability to increase its market share;
(iv) the Company's ability to diversify its product lines; (v) the Company's
ability to expand into additional states; (vi) the Company's avoidance of any
material loss on collection of reinsurance recoverables; (vii) the continued
adequacy of the Company's loss and LAE reserves; and (viii) the Company's
ability to consummate the underwritten Public Offering described in its
Registration Statement on Form S-1 (Registration Number 333-64707). The words
"believe," "expect," "anticipate," "project," and similar expressions identify
forward-looking statements. Readers are cautioned not to place undue reliance on
these forward-looking statements, which speak only as of their dates. The
Company undertakes no obligation to publicly update or revise any
forward-looking statements, whether as a result of new information, future
events or otherwise.



                                                                               2
<PAGE>   4

                       REPORT OF INDEPENDENT ACCOUNTANTS


Board of Governors
Medical Inter-Insurance Exchange

We have reviewed the accompanying consolidated balance sheet of Medical
Inter-Insurance Exchange and subsidiaries as of March 31, 1999, and the related
consolidated statements of income and cash flows for the three-month periods
ended March 31, 1999 and 1998 and the consolidated statement of equity for the
three-month period ended March 31, 1999. These financial statements are the
responsibility of the Company's management.

We conducted our reviews in accordance with standards established by the
American Institute of Certified Public Accountants. A review of interim
financial information consists principally of applying analytical procedures to
financial data, and making inquiries of persons responsible for financial and
accounting matters. It is substantially less in scope than an audit conducted in
accordance with generally accepted auditing standards, which will be performed
for the full year with the objective of expressing an opinion regarding the
financial statements taken as a whole. Accordingly, we do not express such an
opinion.

Based on our reviews, we are not aware of any material modifications that should
be made to the accompanying consolidated financial statements referred to above
for them to be in conformity with generally accepted accounting principles.

We have previously audited, in accordance with generally accepted auditing
standards, the consolidated balance sheets of Medical Inter-Insurance Exchange
and subsidiaries as of December 31, 1998 and 1997, and the related consolidated
statements of income, equity, and cash flows for each of the three years in the
period ended December 31, 1998, not presented herein, and in our report dated
March 24, 1999, we expressed an unqualified opinion on those consolidated
financial statements. In our opinion, the information set forth in the
accompanying consolidated balance sheet as of December 31, 1998, is fairly
stated, in all material respects, in relation to the consolidated balance sheet
from which it has been derived.


                                                               ERNST & YOUNG LLP



New York, New York
May 12, 1999

                                                                               3
<PAGE>   5
PART I   FINANCIAL INFORMATION

ITEM 1.  CONSOLIDATED FINANCIAL STATEMENTS

 CONSOLIDATED BALANCE SHEETS AT MARCH 31, 1999 (UNAUDITED) AND DECEMBER 31, 1998

                        MEDICAL INTER-INSURANCE EXCHANGE

                           CONSOLIDATED BALANCE SHEETS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                                   MARCH 31,           DECEMBER 31,
                                                                                                  ----------           ------------
                                                                                                     1999                 1998
                                                                                                     ----                 ----
                                                                                                  (unaudited)
                                    ASSETS
<S>                                                                                               <C>                  <C>    
Securities available-for-sale:
   Fixed-maturity investments, at fair value (amortized cost: 1999 -
     $1,162,378; 1998 - $1,041,192) ....................................................            $1,163,435            $1,057,739
   Equity investments, at fair value (cost: 1999 - $3,543; 1998 - $3,159) ..............                 3,543                 3,159
   Short-term investments, at cost which approximates fair value .......................               117,118               104,800
                                                                                                    ----------            ----------
         Total investments .............................................................             1,284,096             1,165,698

Cash ...................................................................................                   855                 1,408
Accrued investment income ..............................................................                13,343                13,563
Premium receivable, net ................................................................                17,858                23,876
Reinsurance recoverable on unpaid losses ...............................................               336,921               325,795
Prepaid reinsurance premiums ...........................................................                20,137                26,921
Reinsurance recoverable on paid losses, net ............................................                   337                   724
Deferred policy acquisition costs ......................................................                 6,583                 2,810
Due from Attorney-in-Fact ..............................................................                 5,539                 3,949
Deferred income taxes ..................................................................                41,227                34,731
Receivable for securities ..............................................................                16,803                 3,414
Other assets ...........................................................................                80,003                71,373
                                                                                                    ----------            ----------
         Total assets ..................................................................            $1,823,702            $1,674,262
                                                                                                    ==========            ==========

                            LIABILITIES AND EQUITY
LIABILITIES
Unpaid losses and loss adjustment expenses .............................................            $  972,630            $  951,659
Unearned premiums ......................................................................               142,144                54,139
Premium deposits .......................................................................                    --                28,392
Funds held under reinsurance treaties ..................................................               233,644               228,148
Payable for securities .................................................................               109,725                34,115
Other liabilities ......................................................................                48,179                54,966
                                                                                                    ----------            ----------
         Total liabilities .............................................................            $1,506,322            $1,351,419
                                                                                                    ==========            ==========

Commitments and contingencies (Note 3)

EQUITY
Surplus ................................................................................               316,693               312,087
Accumulated other comprehensive income .................................................                   687                10,756
                                                                                                    ----------            ----------
         Total equity ..................................................................               317,380               322,843
                                                                                                    ----------            ----------
         Total liabilities and equity ..................................................            $1,823,702            $1,674,262
                                                                                                    ==========            ==========
</TABLE>


See accompanying notes


                                                                               4
<PAGE>   6
    CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) FOR THE THREE MONTHS ENDED
                            MARCH 31, 1999 AND 1998

                        MEDICAL INTER-INSURANCE EXCHANGE

                        CONSOLIDATED STATEMENTS OF INCOME
                     (IN THOUSANDS, EXCEPT PER SHARE AMOUNT)

<TABLE>
<CAPTION>
                                                                                                      THREE MONTHS ENDED
                                                                                                             MARCH 31,
                                                                                                ---------------------------------
                                                                                                1999                         1998
                                                                                                ----                         ----
                                                                                                           (unaudited)
<S>                                                                                           <C>                           <C> 
REVENUES
Net premiums earned .....................................................                     $ 45,581                      $ 35,817
Net investment income ...................................................                       17,387                        14,803
Realized investment gains, net ..........................................                         (504)                        1,441
Other revenue ...........................................................                          159                           307
                                                                                              --------                      --------
     Total revenues .....................................................                       62,623                        52,368

EXPENSES
Losses and loss adjustment expenses .....................................                       43,043                        36,050
Underwriting expenses ...................................................                        9,319                         8,194
Funds held charges ......................................................                        4,256                         4,125
                                                                                              --------                      --------
     Total expenses .....................................................                       56,618                        48,369

Income before income taxes ..............................................                        6,005                         3,999
Provision for income taxes ..............................................                        1,399                           538
                                                                                              --------                      --------
     Net income .........................................................                     $  4,606                      $  3,461
                                                                                              ========                      ========

Earnings per share (pro forma) ..........................................                     $   0.38
                                                                                              ========
</TABLE>


See accompanying notes



                                                                               5
<PAGE>   7
         CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) AT MARCH 31, 1999

                        MEDICAL INTER-INSURANCE EXCHANGE

                        CONSOLIDATED STATEMENTS OF EQUITY
                    FOR THE THREE MONTHS ENDED MARCH 31, 1999
                                 (IN THOUSANDS)

                                

<TABLE>
<CAPTION>
                                                                                                  ACCUMULATED
                                                                                                     OTHER
                                                                                                 COMPREHENSIVE 
                                                                              SURPLUS                INCOME            TOTAL EQUITY
                                                                              -------                ------            ------------
                                                                            (unaudited)           (unaudited)           (unaudited)
<S>                                                                          <C>                 <C>                  <C>      
Balance at January 1, 1999 .....................................             $ 312,087              $  10,756             $ 322,843
     Net income ................................................                 4,606                                        4,606
     Other comprehensive income, net of tax:
     Unrealized depreciation on securities 
        available-for-sale, net of deferred taxes ..............                                      (10,069)              (10,069)
                                                                             ---------              ---------             ---------
Balance at March 31, 1999 ......................................             $ 316,693              $     687             $ 317,380
                                                                             =========              =========             =========
</TABLE>


See accompanying notes


                                                                               6
<PAGE>   8
     CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) FOR THE THREE MONTHS
                         ENDED MARCH 31, 1999 AND 1998

                        MEDICAL INTER-INSURANCE EXCHANGE

                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                                THREE MONTHS ENDED
                                                                                                      MARCH 31,
                                                                                              --------------------------
                                                                                                 1999             1998
                                                                                              ---------        ---------
                                                                                                      (unaudited)
<S>                                                                                           <C>              <C>      
CASH FLOWS FROM OPERATING ACTIVITIES
Net income ............................................................................       $   4,606        $   3,461
Adjustments to reconcile net income to net cash provided by 
    operating activities:
Unpaid losses and loss adjustment expenses ............................................          20,971           14,591
Unearned premiums .....................................................................          88,005           99,557
Premium deposits ......................................................................         (28,392)         (21,024)
Premium receivable, net ...............................................................           6,018          (49,407)
Reinsurance balances, net .............................................................           1,541           (3,897)
Deferred policy acquisition costs .....................................................          (3,773)          (5,083)
Realized (gains) losses ...............................................................             504           (1,441)
Depreciation, accretion and amortization ..............................................              52              564
Deferred income tax provision .........................................................          (1,074)             133
Due from Attorney-in-Fact .............................................................          (1,590)           7,396
Accrued investment income .............................................................             220             (690)
Other assets ..........................................................................          (8,630)             672
Other liabilities .....................................................................          (6,787)          10,163
                                                                                              ---------        ---------
Net cash provided by operating activities .............................................          71,671           54,995
                                                                                              =========        =========

CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from fixed-maturity  investment sales ........................................         236,999           91,434
Proceeds from fixed-maturity investments matured, called, or prepaid ..................          26,945           25,989
Proceeds from equity investment sales .................................................              --            1,942
Cost of investments acquired ..........................................................        (386,069)        (137,780)
Change in short-term investments, net .................................................         (12,320)         (43,845)
Net Payable for securities ............................................................          62,221            5,356
                                                                                              ---------        ---------
Net cash used in investing activities .................................................         (72,224)         (56,904)

CASH FLOWS FROM FINANCING ACTIVITIES
Net cash used in financing activities .................................................              --               --

Net change in cash ....................................................................            (553)          (1,909)
Cash at beginning of period ...........................................................           1,408            4,877
                                                                                              ---------        ---------
Cash at end of period .................................................................       $     855        $   2,968
                                                                                              =========        =========
</TABLE>


See accompanying notes



                                                                               7
<PAGE>   9
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1. BASIS OF PRESENTATION

The consolidated financial statements for the interim periods included herein,
which include the accounts of Medical Inter-Insurance Exchange (the "Exchange"),
and its wholly owned subsidiaries Lawrenceville Holdings, Inc. ("LHI"),
Lawrenceville Property and Casualty Co., Inc. ("LP&C"), MIIX Insurance Company
of New York ("MIIX New York"), The MIIX Group Incorporated ("The MIIX Group")
and MIIX Insurance Company (collectively, "the Company"), are unaudited.
However, they have been prepared in accordance with generally accepted
accounting principles for interim financial information and in the opinion of
management, such information reflects all adjustments considered necessary for a
fair presentation. Operating results for the interim period are not necessarily
indicative of the results to be expected for the full year.

These consolidated financial statements and notes should be read in conjunction
with the audited consolidated financial statements and notes of the Company for
the year ended December 31, 1998 which were filed with the Securities and
Exchange Commission on Form 10-K.

2. COMPREHENSIVE INCOME

The Company considers its investment portfolio as available-for-sale and had
unrealized gains at each balance sheet date that are reflected as comprehensive
income in the Consolidated Statements of Equity.

The components of comprehensive income, net of related tax, for the periods
ended March 31, 1999 and 1998 were as follows:


<TABLE>
<CAPTION>
                                                                                         Three Months Ended
                                                                                              March 31,
                                                                                      ------------------------
                                                                                        1999            1998
                                                                                      --------        --------
                                                                                           (in thousands)
<S>                                                                                   <C>             <C>     
Net income ....................................................................       $  4,606        $  3,461
Other comprehensive income:
  Unrealized holding gains (losses) arising during period
     (net of tax of $5,598 and $622, respectively) ............................        (10,397)         (1,156)
  Reclassification adjustment for gains (losses) realized in net income
     (net of tax of $176 and $505, respectively) ..............................            328            (936)
                                                                                      --------        --------

  Net unrealized gains (losses), (net of tax of $5,421 and $1,127,
     respectively) ............................................................        (10,069)         (2,092)
                                                                                      --------        --------

Comprehensive income (loss) ...................................................       $ (5,463)       $  1,369
                                                                                      ========        ========
</TABLE>




3. COMMITMENTS, CONTINGENCIES AND OFF BALANCE SHEET RISK

On January 13, 1998, the Company implemented an "equity collar" (the "Collar")
with a notional value of $85 million around the Company's equity portfolio. The
purpose of the Collar was to reduce equity market volatility and to stabilize
unassigned surplus. The Collar was constructed using European-style S&P 500
options and at March 31, 1998, had an unrealized loss, net of tax, of $6,814,000
which is included in the unrealized depreciation of investments in other
comprehensive income as of March 31, 1998. The Collar expired on July 13, 1998.
To minimize loss exposure due to credit risk, the Company utilizes only those
intermediaries that are approved by the Securities Valuation Office of the
National Association of Insurance Commissioners.



                                                                               8
<PAGE>   10
4. DEFERRED POLICY ACQUISITION COSTS

The following represents the components of deferred policy acquisition costs and
the amounts that were charged to expense for the three months ended March 31,
1999 and 1998.

<TABLE>
<CAPTION>
                                                                              THREE MONTHS ENDED MARCH 31,
                                                                              ----------------------------
                                                                                  1999           1998
                                                                                 -------        -------
                                                                                    (in thousands)
<S>                                                                           <C>               <C>    
Balance at beginning of period ...........................................       $ 2,810        $   100
Cost deferred during the period ..........................................         6,884          5,538
Amortization expense .....................................................        (3,111)          (455)
                                                                                 -------        -------
Balance at end of period .................................................       $ 6,583        $ 5,183
                                                                                 =======        =======
</TABLE>



5. INCOME TAXES

A reconciliation of income tax computed based on the expected annual effective
federal statutory tax rate to total income expense for the periods ended March
31 is as follows:

<TABLE>
<CAPTION>
                                                                 THREE MONTHS ENDED MARCH 31,
                                          ----------------------------------------------------------------------------
                                                         1999                                      1998
                                          ----------------------------------       -----------------------------------
                                                                % OF INCOME                               % OF INCOME
                                           INCOME TAX          BEFORE INCOME         INCOME TAX          BEFORE INCOME
                                             EXPENSE               TAXES               EXPENSE               TAXES
                                          (in thousands)                           (in thousands)
<S>                                          <C>                   <C>                  <C>                   <C>  
Expected annual effective federal            
 income tax at 35%....................      $2,102                 35.0%               $1,400                 35.0%
Decrease in taxes resulting from:
     Tax-exempt interest .............        (670)               (11.2%)                (745)               (18.6%)
     Other ...........................         (33)                (0.5%)                (117)                (2.9%)
                                            ------               ------                ------                 ----
         Total income taxes ..........      $1,399                 23.3%               $  538                 13.5%
                                            ======               ======                ======                 ====
</TABLE>



6. PRO FORMA EARNINGS PER SHARE

The earnings per share reflected on the consolidated statements of income is
calculated on a pro forma basis and gives effect to the assumed aggregate
issuance of approximately 12,000,000 shares of Common Stock to eligible MIIX
Members upon the consummation of the Plan of Reorganization. The calculation
does not give effect to the issuance of shares of Common Stock in the
anticipated underwritten Public Offering, the issuance of shares of Common Stock
to certain officers of the Company on the anticipated underwritten Public
Offering date pursuant to Stock Purchase and Loan Agreements between such
officers and the Company, or to the issuance of shares of Common Stock to the
Medical Society of New Jersey in connection with the purchase of New Jersey
State Medical Underwriters Inc.

7. RECLASSIFICATION

Certain amounts have been reclassified for the prior years to be comparable to
the 1999 presentation.

8. SEGMENT REPORTING

The Company's operations are classified into one reportable segment: providing
professional liability and related insurance coverages to the healthcare
industry. In connection therewith the Company generally offers three products,
occurrence policies, claims made policies with prepaid tail coverage and claims
made policies in each of its markets. The Company distributes its products both
directly to the insureds and through intermediaries. The Company does not
currently prepare discrete financial information for any individual component of
the Company's operations that are regularly reviewed by the chief operating
decision maker and utilized to allocate resources and assess performance.



                                                                               9
<PAGE>   11
ITEM 2.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
         RESULTS OF OPERATIONS

The following discussion should be read in conjunction with the financial
statements and the related notes thereto appearing elsewhere in this Form 10-Q.


RESULTS OF OPERATIONS

THREE MONTHS ENDED MARCH 31, 1999 COMPARED TO THE THREE MONTHS ENDED MARCH 31,
1998

Direct premiums written. Direct premiums written were $141.5 million for the
three months ended March 31, 1999, a decrease of $2.0 million, or 1.4%, from
direct premiums written of $143.5 million for the three months ended March 31,
1998. This net decrease in direct premiums written was composed of an increase
of $7.5 million in direct premiums written in New Jersey and $1.2 million in
other states, offset by decreases in Ohio, Kentucky and Pennsylvania of $4.2
million, $3.3 million and $3.2 million, respectively. The increase in New Jersey
direct premiums written is the net effect of a rate increase taken as of
January 1, 1999 as well as a net increase in new physician group business. The
net decreases in Ohio and Kentucky occurred primarily because policies written
in the three months ended March 31, 1998 with effective dates prior to January
1, 1998 were renewed in the third and fourth quarters of 1998. The net decrease
in Pennsylvania resulted from the loss of $1.7 million of business with
physicians and surgeons following a rate increase which is applicable for
policies renewing after January 1, 1999, and the non-renewal of a large
institutional account, and was partially offset by new physician business
written during the quarter. A substantial portion of the Company's policies are
written with effective dates commencing January 1. Direct written premiums for
the three months ended March 31, 1998, constituted 62.3% of total direct
written premiums in 1998. A similar, but somewhat lower ratio is expected for
1999 as the proportion of business with effective dates other than January 1,
principally written outside of New Jersey and Pennsylvania, continues to rise.

Net premiums earned. Net premiums earned increased approximately $9.8 million,
or 27.3% to $45.6 million, for the three months ended March 31, 1999 from $35.8
million for the three months ended March 31, 1998. This increase is mainly
attributable to increased direct premiums written during the latter half of 1998
that are being earned during 1999, including, particularly, several new large
institutional policies written in Pennsylvania and Connecticut during the third
quarter of 1998.


                                                                              10
<PAGE>   12
Net investment income. Net investment income increased approximately $2.6
million or 17.5% to $17.4 million for the three months ended March 31, 1999 from
$14.8 million for the same period in 1998. Average invested assets increased to
approximately $1.2 billion during the three months ended March 31, 1999 compared
to approximately $1.0 billion for the same period last year. The average
annualized pre-tax yield on the investment portfolio increased to 5.77% for the
three months ended March 31, 1999 from 5.71% for the same period in 1998
primarily as a result of changes in asset allocation with an increased
concentration in higher pre-tax yielding securities.

Realized investment gains (losses). Net realized investment gains (losses)
decreased approximately $1.9 million to a $0.5 million net realized loss for the
three months ended March 31, 1999 compared to a $1.4 million net realized gain
for the same period in 1998. In 1999, the losses are due to bond sales in a
slightly increasing interest rate environment. In 1998, substantially all of the
gains resulted from the sale of bonds in a generally falling interest rate
environment.

Other revenue. Other revenue decreased approximately $0.1 million or 48.2%, to
$0.2 million for the three months ended March 31, 1999 from $0.3 million for the
same period last year and is composed primarily of finance charge income
associated with the Company's financing of policyholder premiums, which declined
as the Company outsourced its installment payment plans in the second quarter of
1998.

Losses and loss adjustment expenses (LAE). The provision for losses and LAE
increased $6.9 million, or 19.4%, to $43.0 million for the three months ended
March 31, 1999 from $36.1 million for the three months ended March 31, 1998. The
provision for losses and LAE is net of ceded losses and LAE of $12.7 million and
$15.5 million for the three months ended March 31, 1999 and 1998, respectively.
The ratio of net losses and LAE to net earned premiums declined to 94.4% for the
three months ended March 31, 1999 from 100.7% for the same period in 1998. This
decrease in loss and LAE ratio is principally attributable to a net reduction
in the gross loss and ALAE ratio on the Company's occurrence business for 1999,
combined with an increasing portion of the Company's expansion business being
written on a claims made basis which is expected to result in a lower ultimate
loss and LAE ratio. Changes in loss and LAE reserves held on 1994 and prior
accident years also impacted the provision for loss and LAE and the ratio of
net loss and LAE to earned premium for the three months ended March 31, 1999.
The changes in loss and LAE reserves held on 1994 and prior accident years were
as follows: gross loss and LAE reserves were reduced by $0.8 million, ceded
loss and LAE reserves were reduced by $1.6 million, and ceded earned premiums
were reduced by $0.4 million for the three months ended March 31, 1999.



                                                                              11
<PAGE>   13
There were no adjustments made to loss and LAE reserves held on prior accident
years for the three months ended March 31, 1998.

Underwriting expenses. Underwriting expenses increased $1.1 million or 13.7% to
$9.3 million for the three months ended March 31, 1999, from $8.2 million for
the three months ended March 31, 1998. The expense ratio was 20.4% for the three
months ended March 31, 1999 compared to 22.9% for the same period in 1998. The
increase in expenses was attributable to the cost of acquiring new business,
primarily through a broker distribution network, and to the increased cost of
facilities and staff necessary to service the increased volume of business
activity in 1999. The expense ratio declined in the three months ended March 31,
1999 as compared to the three months ended March 31, 1998 primarily as the
result of greater economies of scale present with the larger premium in 1999.

Funds held charges. Funds held charges increased $0.2 million, or 3.2%, to $4.3
million for the three months ended March 31, 1999, from $4.1 million for the
three months ended March 31, 1998. Although there was an increase from March 31,
1998 to March 31, 1999 charges, the ratio of funds held charges to balances at
December 31, 1997 and December 31, 1998 decreased from 2.3% to 1.9%. The
decrease in the ratio of funds held charges to the beginning funds held balance
is the result of three principal factors: an adjustment to funds held charges of
$0.2 million related to the 1994 aggregate reinsurance contract as the result of
a reduction in ceded losses for the three months ended March 31, 1999; reduced
funds held charges resulting from adjustments to ceded losses made during the
fourth quarter of 1998; and a lower contractual funds held charge rate
applicable to the 1998 and 1999 aggregate reinsurance contracts. Funds held
charges are calculated based upon beginning of quarter funds held balances.

Income taxes. Income taxes increased approximately $0.9 million to $1.4 million
for the three months ended March 31, 1999, resulting in an effective tax rate of
23.3%, compared to $0.5 million and an effective tax rate of 13.5% for the same
period in 1998. This increase was primarily attributable to an increase in
pre-tax income in 1999 of $2.0 million resulting in additional tax of $0.7
million at a 35% rate, and an increase in taxes of $0.2 million associated with
a reduction in tax-exempt interest and other items in 1999.



                                                                              12
<PAGE>   14
Net income. Net income was $4.6 million for the three months ended March 31,
1999, an increase of 33.1% from net income of $3.5 million for the three months
ended March 31, 1998. This net increase was the result of increased earned
premiums and investment income, somewhat offset by less than proportional
increases in incurred losses and LAE and in underwriting expenses, and also
somewhat offset by a $1.9 million reduction in realized gains.

FINANCIAL CONDITION

Cash and invested assets. Aggregate invested assets, including cash and short
term investments, were $1,285.0 million at March 31, 1999 and $1,167.1 million
at December 31, 1998. The increase in invested assets between December 31, 1998
and March 31, 1999 resulted primarily from cash flow from operations generated
during the period.

Fixed maturities available for sale, including short-term investments,
aggregated approximately $1.3 billion, or 99.7% of the investment portfolio of
the Company as of March 31, 1999. At that date, the average credit quality of
the fixed income portfolio was "AA-," as defined by Standard & Poor's, while the
total portfolio effective duration (including short-term investments) was 5.24
years.

In 1997, the Company implemented an "equity collar" around its equity securities
of $81.6 million. An "equity collar" is an option position created with the
simultaneous purchase and sale of an equal number of put and call options. This
resulting option position establishes, for a specified time period, both a
ceiling and a floor with respect to the financial performance of the underlying
asset upon which the equity collar is established. The collar transaction was
executed on July 8, 1997 and expired on January 2, 1998. The purpose of the
collar was to reduce equity market volatility and to stabilize unassigned
surplus. The collar was constructed using European-style S&P 500 options. A
"European-style" option is an option contract that may be exercised only upon
expiration of the contract whereas an "American-style" option may be exercised
at any time prior to the expiration of the contract. The reference to "S&P 500"
refers to the underlying asset upon which the option contract's value will be
based. To minimize loss exposure due to credit risk, the Company utilized
intermediaries with a Standard and Poor's rating of "AA" or better.




                                                                              13
<PAGE>   15
In 1998, another equity collar was implemented with a notional value of $85
million around the equity portfolio. Again, the purpose of the collar was to
reduce equity market volatility and to stabilize unassigned surplus. The collar
was constructed using European style S&P 500 options. The collar transaction was
executed on January 13, 1998 and expired on July 13, 1998.

Since the expiration of the equity collar mentioned above, the Company has not
held any derivative investments.

In July, 1998 the Company liquidated its equity portfolio as part of a medium
term portfolio strategy that the Company believes will increase investment
yield. Following liquidation, the proceeds were reinvested in fixed maturity
securities.

Unpaid losses and LAE, reinsurance recoverable on unpaid losses and LAE and
funds held under reinsurance treaties. Gross unpaid losses and LAE were $972.6
million at March 31, 1999 and $951.7 million at December 31, 1998. Reinsurance
recoverable on unpaid losses and LAE was $336.9 million at March 31, 1999 and
$325.8 million at December 31, 1998. Funds held under reinsurance treaties,
which are unrestricted, collateralize a significant portion of reinsurance
recoverable on unpaid losses and LAE and were $233.6 million at March 31, 1999,
and $228.1 million at December 31, 1998. The increases in these amounts were
consistent with the continued growth in the Company's book of business.

Equity. Total equity was $317.4 million at March 31, 1999 and $322.8 million at
December 31, 1998. The net decrease was attributable to net income of $4.6
million offset by changes in unrealized net depreciation on investments of $10.0
million included in accumulated other comprehensive income.

LIQUIDITY AND CAPITAL RESOURCES

The MIIX Group, Incorporated. The MIIX Group is a holding company whose only
material assets immediately after the Reorganization will be the capital stock
of MIIX Insurance and the Attorney-in-Fact. The net proceeds of the anticipated
Public Offering will be used for general corporate purposes, which may include,
without limitation, increasing the capitalization of The MIIX Group's insurance
subsidiaries in order to support their continued growth and for financing
potential acquisitions. The MIIX Group's ongoing cash flow will consist
primarily of dividends





                                                                              14
<PAGE>   16
and other permissible payments from its subsidiaries. The MIIX Group will depend
upon such payments for funds for general corporate purposes and for the payment
of dividends on the Common Stock.

The payment of dividends to The MIIX Group by MIIX Insurance will be subject to
limitations imposed by the New Jersey Holding Company Act. Based upon these
limitations, the maximum amount that will be available for payment of dividends
to The MIIX Group by MIIX Insurance in any year without the prior approval of
regulatory authorities is subject to restrictions related to surplus and net
income. MIIX Insurance's future cash flow available to The MIIX Group may be
influenced by a variety of factors, including cyclical changes in the medical
malpractice insurance market, MIIX Insurance's financial results, insurance
regulatory changes, including changes in the limitations imposed by the New
Jersey Holding Company Act on the payment of dividends by MIIX Insurance, and
changes in general economic conditions. The MIIX Group expects that the current
limitations that will be imposed on MIIX Insurance should not affect its ability
to declare and pay dividends sufficient to support The MIIX Group's initial
dividend policy.

MIIX Insurance. The primary sources of MIIX Insurance's liquidity, on both a
short- and long-term basis, will be funds provided by insurance premiums
collected, net investment income, recoveries from reinsurance and proceeds from
the maturity or sale of invested assets. Such funds are generally used to pay
claims, LAE, operating expenses, reinsurance premiums and taxes. The Company's
net cash flow from operating activities was approximately $71.7 million and
$55.0 million for the three months ended March 31, 1999 and 1998 and $90.1
million for the year ended 1998. Because of the inherent unpredictability
related to the timing of the payment of claims, it is not unusual for cash flow
from operations for a medical malpractice insurance company to vary, perhaps
substantially, from year to year.                                            

The Company held collateral of $233.6 million at March 31, 1999 and $228.1 at
December 31, 1998, in the form of funds withheld, for recoverable amounts on
ceded unpaid losses and loss adjustment expenses under certain reinsurance
agreements. Under the contracts, reinsurers may require that a trust fund be
established to hold the collateral should one or more triggering events occur,
such as a downgrade in the Company's A.M. Best rating to B+ or lower, or a
reduction in statutory capital and surplus to less than $20 million. Otherwise,
no restrictions are placed on investments held in support of the funds withheld.
In accordance with the provisions of the reinsurance






                                                                              15
<PAGE>   17
contracts, the funds withheld are credited with interest at contractual rates
ranging from 7.5% to 8.6%, which is recorded as an expense in the year incurred.

The Company invests its positive cash flow from operations in fixed maturity
securities. The current investment strategy, which will be continued by MIIX
Insurance immediately after the Reorganization, seeks to maximize after-tax
income through a high quality, diversified, duration sensitive, taxable bond and
tax-preferenced municipal bond portfolio, while maintaining an adequate level of
liquidity.

Based on historical trends, market conditions and its business plans, the
Company believes that its sources of funds will be sufficient to meet its
liquidity needs over the next 18 months and beyond. However, because economic,
market, and regulatory conditions may change, there can be no assurance that the
Company's funds will be sufficient to meet these liquidity needs.

The Attorney-in-Fact currently leases the Company's headquarters in
Lawrenceville, New Jersey from the Medical Society, a related party. The Company
is considering purchasing this building. An independent appraisal firm has been
retained by the Company to determine the fair market value of the property to
assist both parties in negotiating the transaction.

YEAR 2000

Because certain computer software programs have historically been designed to
use a two-digit code to identify the year for date-sensitive material, such
programs may not properly recognize post twentieth century dates. This could
result in system failures and improper information processing that could disrupt
the Company's business operations.

The Company began evaluating this issue in 1996 in connection with an overall
evaluation of the Company's systems and during 1997 assigned a project manager
to study the Company's information systems and computers to determine whether
they will appropriately handle post-1999 date codes. The identification of
compliance issues included the Company's internal systems and processes, as well
as exposure from service providers, brokers and other external business
partners. Software applications, hardware and information technology ("I/T")
infrastructure and non I/T systems such as the Company's telephone, security and
heating and ventilating systems have been



                                                                              16
<PAGE>   18
reviewed to identify those requiring upgrading or replacement to improve current
computing capabilities and to ensure that they are Year 2000 compliant. In the
course of evaluating the Year 2000 readiness of its internal systems, the
Company determined that its claims administration system is not Year 2000
compliant. The Company has purchased a replacement system that the vendor has
represented to be Year 2000 compliant and is expected to be operational in 1999.
The Company has also determined that its telephone equipment is not Year 2000
compliant and is currently upgrading its telephone equipment to make it Year
2000 compliant. The new telephone equipment is expected to be operational in
1999.

During 1997 and 1998 the Company upgraded all its I/T systems to improve their
performance and efficiency. As part of this process, the Company obtained
certifications from the vendors of such new systems that such systems would be
Year 2000 compliant. The Company has conducted internal tests of its new systems
to ensure that they are Year 2000 compliant and continues to conduct such tests.
To date, such tests have not revealed any Year 2000 issues other than in
connection with the claims administration system discussed above. However, the
Company has retained an outside expert to independently evaluate the Year 2000
readiness of the Company's internal systems. The Company may also be adversely
affected if Year 2000 issues result in additional claims being made against the
Company's insureds. The Company's liability for such claims, if any, is not
clearly established. A number of companies who underwrite liability coverage in
the healthcare industry have submitted applications to various state regulators
requesting that policy exclusions for such liability, if any, be approved. Other
carriers have advised their clients of their intent to deny coverage in certain
circumstances. The Company has not yet taken a formal position and is still
conducting research on the matter.

The Company is in the process of sending inquiries to its service providers,
brokers and other external business partners to determine whether they may
experience Year 2000 problems that could affect the Company. Management is
currently evaluating alternative contingency plans that could become necessary
if its own or its significant external business partners' Year 2000 remediation
efforts fail. Such alternatives will most likely involve the assignment of
internal and external resources to process business manually during the duration
of any non-compliance. All contingency planning and testing efforts are
scheduled for completion in the third quarter of 1999. It is not possible at
this time to estimate the cost, if any, of such contingency plans or system
failures.





                                                                              17
<PAGE>   19
Remediation costs to date (including expenditures associated with replacement
systems) have been approximately $441,000 and are estimated to be less than $1
million through the completion of remediation, which is expected in 1999. These
costs have been considered in preparing the Company's capital and operating
budgets. There can be no assurance, however, that remediation efforts will be
completed within these estimated costs and time periods. 

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There have been no material changes in the reported market risks since the end
of the most recent fiscal year as described in the Company's Annual Report on
Form 10-K for the year ended December 31, 1998.




                                                                              18
<PAGE>   20
PART II OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

ACTIONS OPPOSING THE PLAN OF REORGANIZATION

The description of legal proceedings in the Company's Annual Report on Form 10-K
for the year ended December 31, 1998 is incorporated herein by reference. As
disclosed in such Form 10-K, the appellants filed a motion with the Supreme
Court of New Jersey seeking to enjoin the Plan of Reorganization. That motion
has been denied. Other pending actions described in such Form 10-K remain
pending.



                                                                              19
<PAGE>   21
ITEM 2.           CHANGES IN SECURITIES AND USE OF PROCEEDS

                  Not applicable.

ITEM 3.           DEFAULTS UPON SENIOR SECURITIES

                  Not applicable.

ITEM 4.           SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

                  Not applicable.

ITEM 5.           OTHER INFORMATION

                  Not applicable.

ITEM 6.           EXHIBITS AND REPORTS ON FORM 8-K

                  a.  Exhibits

                      The following exhibits are filed herewith:

                      10.31   Draft Excess Cession Contract and Excess Event
                              Protection, effective January 1, 1999, among
                              Medical Inter-Insurance Exchange of New Jersey and
                              Swiss Reinsurance Company; American Re-Insurance
                              Company; and Hannover Ruckversicherungs.

                      10.33   Draft Addendum No. 3 to Combined Quota Share,
                              Aggregate and Specific Excess of Loss Reinsurance
                              Treaty, effective November 1, 1998, among Medical
                              Inter-Insurance Exchange and Hannover Reinsurance
                              (Ireland) Ltd.; E&S Reinsurance Company (Ireland)
                              Inc.; Underwriters Reinsurance Company (Barbados)
                              Inc., and European Reinsurance Company of Zurich.

                      27.1    Financial Data Schedules.

                  b.  Reports on Form 8-K

                      No reports on Form 8-K were filed during the first
                      quarter of 1999.


                                                                              20
<PAGE>   22

                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this Report to be signed on its behalf by the
undersigned, thereunto duly authorized.

                          THE MIIX GROUP, INCORPORATED

                 By:      /s/ DANIEL GOLDBERG                
                      ---------------------------------------
                                   Daniel Goldberg
                      President and Chief Executive Officer
                      (principal executive officer)


                 By:      /s/ KENNETH KOREYVA       
                      ---------------------------------------
                                   Kenneth Koreyva
                      Executive Vice President and Chief Financial Officer
                      (principal financial and accounting officer)


                 DATED:   MAY 17, 1999                       
                          -----------------------------------