<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-Q/A
                   QUARTERLY REPORT UNDER SECTION 13 or 15 (d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

(Mark One)

[ X ]  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES
       EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2000

                                                               OR

[   ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES
       EXCHANGE ACT OF 1934

For the transition period from ______________ to ______________

                         Commission file number 0-21752

                         NORTHSTAR HEALTH SERVICES, INC.
             (Exact name of registrant as specified in its charter)

           DELAWARE                                       25-1697152
(State or other jurisdiction of                        (I.R.S. Employer
 incorporation or organization)                       Identification No.)

              665 PHILADELPHIA STREET, INDIANA, PENNSYLVANIA 15701
                    (Address of principal executive offices)

                                  724-349-7500
              (Registrant's telephone number, including area code)

         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 period that 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
                              ---                     ---

         State the number of shares outstanding of each of the issuer's classes
of common stock, as of the last practicable date:

               CLASS                              OUTSTANDING AS OF May 5, 2000
-------------------------------------             -----------------------------
Common Stock, par value $.01 per share                      5,975,424

Transitional Small Business Disclosure Format (Check one):

                          YES                      NO  X
                              ---                     ---
<PAGE>   2

                NORTHSTAR HEALTH SERVICES, INC. AND SUBSIDIARIES
                ------------------------------------------------



INDEX                                                                     PAGE
-----                                                                     ----

Part I - FINANCIAL INFORMATION

    Item 1.

         Condensed Consolidated Balance Sheets as of
              March 31, 2000 and December 31, 1999                          1

         Condensed Consolidated Statements of Operations
              for  the three months ended March 31, 2000 and 1999           3

         Condensed Consolidated Statements of Cash Flows
              for  the three months ended March 31, 2000 and 1999           4

         Notes to Condensed Consolidated Financial Statements               5

    Item 2.

         Management's Discussion and Analysis of Financial
              Condition and Results of Operations                           9

    Item 3.

         Quantitative and Qualitative Disclosure About Market
              Risk Sensitive Instruments                                   12

Part II - OTHER INFORMATION

    Item 1. - Legal Proceedings                                            12

    Item 2. - Changes in Securities and Use of Proceeds                    13

    Item 6 - Exhibits and reports on form 8-K                              14

<PAGE>   3
                                        3

Item 1. - Financial Statements


                NORTHSTAR HEALTH SERVICES, INC. AND SUBSIDIARIES

                 CONDENSED CONSOLIDATED BALANCE SHEETS (Note 1)

                             (Dollars in Thousands)
<TABLE>
<CAPTION>
                                A S S E T S
                                -----------                        Restated         Restated
                                                                   March 31,       December 31,
                                                                     2000             1999
                                                                  -----------      ------------
                                                                  (Unaudited)
<S>                                                                <C>             <C>
CURRENT ASSETS:
    Cash and cash equivalents                                       $   405         $   754
    Accounts receivable-
       Patients, net of allowances for doubtful accounts of
           $338 and $430 respectively                                 4,070           3,850
       Management fees                                                    5              13
       Miscellaneous                                                    152             206
    Prepaid expenses and other current assets                           265             107
                                                                    -------         -------
    Total current assets                                              4,897           4,930
                                                                    -------         -------
PROPERTY AND EQUIPMENT, net                                           1,311           1,369

INTANGIBLE ASSETS, net (Note 2)                                      19,273          19,477

INVESTMENT IN SUBSIDIARY                                                179             141

OTHER ASSETS                                                            106             110

TOTAL ASSETS                                                        $25,766         $26,027
                                                                    =======         =======

</TABLE>





   The accompanying notes are an integral part of these financial statements.


                                       1
<PAGE>   4



                NORTHSTAR HEALTH SERVICES, INC. AND SUBSIDIARIES

                 CONDENSED CONSOLIDATED BALANCE SHEETS (Note 1)

                    (Dollars in Thousands, Except Share Data)

<TABLE>
<CAPTION>
                   LIABILITIES AND STOCKHOLDERS' EQUITY
                   ------------------------------------                          Restated           Restated
                                                                                 March 31,         December 31,
                                                                                    2000               1999
                                                                                 ---------         ------------
                                                                                (Unaudited)
<S>                                                                               <C>               <C>
CURRENT LIABILITIES:
    Current portion of long-term debt (Note 3)
       Senior Debt                                                                $ 12,749          $ 13,802
       Thomas Zaucha and Zaucha Family Limited Partnership                           5,005             4,989
       Other debt                                                                      103                87
    Accounts payable                                                                   498               591
    Accrued expenses
       Thomas Zaucha and Zaucha Family Limited Partnership                           9,757             9,827
       Other Obligations                                                             1,884             1,911
    Contractual obligations to employees                                               758               709
                                                                                  --------          --------
           Total current liabilities                                                30,754            31,916
                                                                                  --------          --------

LONG-TERM DEBT (Note 3)                                                                259               306

MINORITY INTEREST                                                                      122                71

           Total liabilities                                                        31,135            32,293

STOCKHOLDERS' EQUITY
    Preferred stock, par value $.01 per share, 1,000,000 shares
       authorized, none issued                                                          --                --
    Common stock, par value $.01 per share, 20,000,000 shares authorized;
       6,337,988 shares issued at March 31, 2000 and December 31, 1999                  63                63
    Additional paid-in capital                                                      22,642            22,642
    Warrants outstanding                                                             1,487             1,487
    Retained deficit                                                               (29,108)          (30,005)
    Less:  Treasury stock, 362,564 shares in 2000 and 1999, at cost                   (453)             (453)
                                                                                  --------          --------
           Total stockholders' equity/(deficit)                                     (5,369)           (6,266)
                                                                                  --------          --------
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY                                        $ 25,766          $ 26,027
                                                                                  ========          ========

</TABLE>



   The accompanying notes are an integral part of these financial statements.


                                       2
<PAGE>   5



                NORTHSTAR HEALTH SERVICES, INC. AND SUBSIDIARIES

            CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Note 1)

                    (Dollars in Thousands, Except Share Data)
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                                   Restated             Restated
                                                                   Three Months Ended March 31,
                                                                 --------------------------------
                                                                     2000                1999
                                                                 -----------          -----------
<S>                                                              <C>                  <C>
REVENUE:
   Net patient service revenue                                   $     7,459          $     6,336
   Management fee revenue                                                 31                  343
                                                                 -----------          -----------
       Total revenue                                                   7,490                6,679

COSTS OF SERVICE                                                       3,121                3,100
                                                                 -----------          -----------
       Gross profit                                                    4,369                3,579

OPERATING EXPENSES:
    Selling, general and administrative expenses                       2,630                2,510
    Bad debt expense                                                     (22)                  99
    Amortization of intangibles                                          204                  228
    Depreciation and amortization                                         93                  145
                                                                 -----------          -----------
       Total operating expenses                                        2,905                2,982
                                                                 -----------          -----------

OPERATING INCOME                                                       1,464                  597

NON-OPERATING (INCOME)/ EXPENSES:
    Interest expense, net                                                497                  503
    Equity in Subsidiary Income                                          (86)                 (28)
    Other income, net                                                     (1)                  (2)
                                                                 -----------          -----------
                  Total net non-operating  expenses                      410                  473
                                                                 -----------          -----------

INCOME BEFORE INCOME TAXES                                             1,054                  124

INCOME TAX PROVISION (CREDIT)                                             20                  (14)
                                                                 -----------          -----------

INCOME BEFORE  MINORITY INTEREST                                       1,034                  138

MINORITY INTEREST                                                        137                   62
                                                                 -----------          -----------

NET INCOME                                                       $       897          $        76
                                                                 ===========          ===========

NET INCOME PER SHARE - BASIC                                     $      0.15          $      0.01
                                                                 ===========          ===========

NET INCOME PER SHARE - DILUTED                                   $      0.15          $      0.01
                                                                 ===========          ===========

WEIGHTED AVERAGE NUMBER OF COMMON SHARES                           5,975,424            5,975,424
                                                                 ===========          ===========

WEIGHTED AVERAGE NUMBER OF COMMON SHARES AND EQUIVALENTS           6,177,955            6,065,801
                                                                 ===========          ===========

</TABLE>


   The accompanying notes are an integral part of these financial statements.


                                       3
<PAGE>   6






                NORTHSTAR HEALTH SERVICES, INC. AND SUBSIDIARIES

            CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Note 1)
                             (Dollars in Thousands)
                                   (Unaudited)

<TABLE>
<CAPTION>
                                                                                  Restated          Restated
                                                                                 Three Months Ended March 31,
                                                                                 ----------------------------
                                                                                    2000             1999
                                                                                   -------          -------
<S>                                                                                <C>             <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
    Net income                                                                     $   897          $    76
    Adjustments to reconcile net income to net cash provided by  operating
       activities-
    Depreciation and amortization                                                      402              548
    Provision for doubtful accounts                                                    (22)              99
    Interest on discounted obligation                                                   19               38
    Provision for increase(decrease) in contractual obligations to
       employees                                                                        57              (50)
    Equity in Subsidiary Income                                                        (86)              28

    Minority interest                                                                  137               62
    Change in current assets and liabilities-
    (Increase)/Decrease in receivables                                                (136)             193
    (Increase)/Decrease in other current assets                                       (158)             245
    (Decrease)/Increase in accounts payable                                            (93)              19
    (Decrease) in accrued expenses                                                     (97)             (38)
                                                                                   -------          -------
                  Net cash provided by operating activities                            920            1,220
                                                                                   -------          -------

CASH FLOWS FROM INVESTING ACTIVITIES:
    Proceeds from sale of equipment                                                     --                1
    Capital expenditures                                                               (99)            (139)
    Deposits, loans and investments                                                      4              (18)
    Distribution from Subsidiary                                                        48              (25)
                                                                                   -------          -------
                  Net cash used in investing activities                                (47)            (181)
                                                                                   -------          -------

CASH FLOWS FROM FINANCING ACTIVITIES:
    Payments on debt                                                                (1,127)            (164)
    Distributions to minority interests                                                (86)             (35)
    Payments of contractual obligations to employees                                    (9)             (33)
                                                                                   -------          -------
                  Net cash used in financing activities                             (1,222)            (232)
                                                                                   -------          -------

NET (DECREASE)/INCREASE IN CASH AND CASH EQUIVALENTS
                                                                                      (349)             807

CASH AND CASH EQUIVALENTS, beginning balance                                           754              901
                                                                                   -------          -------

CASH AND CASH EQUIVALENTS, ending balance                                          $   405          $ 1,708
                                                                                   =======          =======

SUPPLEMENTAL DISCLOSURE OF CASH FLOW DATA:
    Interest paid                                                                  $   542          $   445
    Income taxes paid/(refunded)                                                        20              (14)

</TABLE>


   The accompanying notes are an integral part of these financial statements.


                                       4
<PAGE>   7

                NORTHSTAR HEALTH SERVICES, INC. AND SUBSIDIARIES

              NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES:

General

These condensed consolidated financial statements of Northstar Health Services,
Inc. (the "Company") are unaudited and reflect all adjustments (consisting only
of normal recurring adjustments) which are, in the opinion of management,
necessary for a fair presentation of the results of operations for the interim
period. These statements should be read in conjunction with the consolidated
financial statements and notes thereto contained in the Company's Form 10-K/A
for the year ended December 31, 1999.

Restatements

The financial statements for the three months ended March 31, 1999 and 2000 have
been restated to correct an error in recording the Company's 49% ownership
interest in an outpatient clinic partnership. The Company had previously
consolidated this partnership since the Company controlled the operation of the
Partnership. These statements have been corrected to reflect the operations of
the partnership using the Equity Method of Accounting. This correction had no
effect on Net income or Shareholders' Equity of the Company.

Management fee operating expenses for the three months ended March 31, 1999 have
also been restated for better presentation with no effect on operating or net
income. Management fee expenses had previously been reported on a separate line
item in Operating Expenses. These costs have now been more properly included in
the appropriate expense categories, primarily Cost of Service and Selling,
general and administrative expenses. The total of all restatements had no effect
on Net Income for any of the periods presented. However, Total Revenue decreased
by $304,000 and $407,000 for the three months ended March 31, 1999 and 2000,
respectively. Total Operating Expenses decreased by $278,000 and $93,000 for the
same periods. Operating Income for the three months ended March 31, 1999 and
2000 decreased by $57,000 and $176,000, respectively. Non-Operating expenses for
the three months ended March 31, 1999 and 2000, decreased $28,000 and $86,000
due to the restatements. Income before Minority Interest and Minority Interest
both decreased by $29,000 and $90,000 for the three months ended March 31, 1999
and 2000, respectively. These restatements did not change Net Income.

     CONDENSED SUMMARY OF RESTATEMENTS FOR THREE MONTHS ENDED MARCH 31, 1999
<TABLE>
<CAPTION>
(In thousands)                              AS FILED         RESTATEMENTS            RESTATED
                                            --------         ------------            --------
<S>                                            <C>                   <C>                <C>
TOTAL REVENUE                                  6,983                 (304)              6,679

GROSS PROFIT                                   3,914                 (335)              3,579

TOTAL OPERATING EXPENSES                       3,260                 (278)              2,982

OPERATING INCOME                                 654                  (57)                597

TOTAL NON-OPERATING EXPENSES                     501                  (28)                473

INCOME BEFORE MINORITY INTEREST                  167                  (29)                138

MINORITY INTEREST                                 91                  (29)                 62

NET INCOME                                        76                   --                  76
</TABLE>


                                       5
<PAGE>   8

     CONDENSED SUMMARY OF RESTATEMENTS FOR THREE MONTHS ENDED MARCH 31, 2000
<TABLE>
<CAPTION>
(In thousands)                              AS FILED         RESTATEMENTS            RESTATED
                                            --------         ------------            --------
<S>                                            <C>                   <C>                <C>
TOTAL REVENUE                                  7,897                 (407)              7,490

GROSS PROFIT                                   4,638                 (269)              4,369

TOTAL OPERATING EXPENSES                       2,998                  (93)              2,905

OPERATING INCOME                               1,640                 (176)              1,464

TOTAL NON-OPERATING EXPENSES                     496                  (86)                410

INCOME BEFORE MINORITY INTEREST                1,124                  (90)              1,034

MINORITY INTEREST                                227                  (90)                137

NET INCOME                                       897                   --                 897
</TABLE>


Management Fees

The Company previously managed a business on a contract basis that provided
mobile diagnostic services. In conjunction with this contract, the Company
received compensation in the form of a monthly management fee. This fee was
equal to the net income or loss of the managed business after the payment of
certain agreed-upon salaries and benefits to certain parties. The Company's
mobile diagnostic services business was terminated on August 13, 1999.
Management fee income also includes fee income from the management of a physical
therapy partnership where the Company does not have majority ownership.
Management fee operating expenses have been restated for better presentation
with no effect on operating income.

Earnings Per Common Share

Earnings per share for the three months ended March 31, 2000 and 1999 were
calculated in accordance with Statement of Financial Accounting Standards No.
128 (SFAS No. 128), "Earnings per Share," using the weighted average number of
shares outstanding during the period and including the effect of stock options
outstanding. Pursuant to the Company's 1992, 1994, and 1997 Stock Option plans
and certain stock options granted outside of these plans, options for a total of
2,500 shares of the Company's common stock have been granted and no options have
been exercised for the three month period ended March 31, 2000.

The following table reconciles the number of shares utilized in the earnings per
share calculations for the three-month periods ended March 31, 2000 and 1999
(dollars in thousands):

<TABLE>
<CAPTION>
                                                             For the three months ended March 31,
                                                             ------------------------------------
                                                                   2000                 1999
                                                                   ----                 ----
<S>                                                           <C>                  <C>
         Basic earnings per share:
            Net income                                         $      897            $       76
            Average shares outstanding                          5,975,424             5,975,424
            Income per share                                   $     0.15            $     0.01
         Diluted earnings per share:
            Net income                                         $      897            $       76
            Average shares outstanding                          5,975,424             5,975,424
            Stock options                                         202,531                90,377
                                                               ----------            ----------
            Diluted average shares outstanding                  6,177,955             6,065,801
            Income per share                                   $     0.15            $     0.01
</TABLE>



                                      6

<PAGE>   9

For the three month periods ended March 31, 2000 and 1999, options to purchase
959,719 and 580,800 and warrants to purchase 454,953 and 565,000 shares of
common stock, respectively, were outstanding, but were not included in the
computation of diluted earnings per share because the options' and warrants'
exercise prices were greater than the average market price of the Company's
common shares for the periods. Also, not included in the calculation of diluted
earnings per share were the shares that may be issued to the Zaucha's in
connection with the Keystone merger. See Note 5. The Zaucha Stock Guarantee
could be satisfied by all cash, all stock, or a combination of both cash and
stock.

2. INTANGIBLE ASSETS:

Intangible assets and the related amortization periods consist of the following
(dollars in thousands):

<TABLE>
<CAPTION>
                                                           March 31,       December 31,
                                                             2000              1999
                                                           --------        ------------
<S>                                                       <C>               <C>
Excess of cost over net assets acquired (40 years)         $ 19,144          $ 19,144
Employment agreements (2 to 7 1/2 years)                        625               625
Keystone tradename (20 years)                                 2,500             2,500
Covenant not to compete (5 years)                                --                53
Assembled Keystone workforce (5 years)                          400               400
Deferred financing and other costs (5 years)                     --               754
                                                           --------          --------

Gross intangible assets                                      22,669            23,476

Less-accumulated amortization                                (3,396)           (3,999)
                                                           --------          --------

Net intangible assets                                      $ 19,273          $ 19,477
                                                           ========          ========
</TABLE>


3.  DEBT:

Debt consists of the following (dollars in thousands):

<TABLE>
<CAPTION>
                                                                               March 31,       December 31,
                                                                                 2000             1999
                                                                               --------        ------------
<S>                                                                            <C>               <C>
Amended and Restated Credit Agreement with two Senior Lenders
                                                                               $ 12,749          $ 13,802
Non-interest bearing term notes to Thomas Zaucha and the Zaucha
     Family Limited Partnership                                                   2,625             2,625
Term notes to Thomas Zaucha and the Zaucha Family Limited Partnership             2,400             2,400
Capital lease obligations with interest rates ranging from 9% to 15.6%              147               192
Other debt                                                                          353               380
                                                                               --------          --------
Total long-term debt                                                             18,274            19,399

     Less:
         Current portion                                                        (17,857)          (18,878)
         Debt discount                                                             (158)             (215)
                                                                               --------          --------
Long-term debt                                                                 $    259          $    306
                                                                               ========          ========
</TABLE>


During the first quarter of 2000, the Company's weighted average interest rate
was 9.8%.

On September 30, 1999, the Company restructured its credit facility with its
Senior Lender, Cerberus Capital Management, LLC, pursuant to an Amended and
Restated Credit Agreement (the "Restated Credit Agreement"). As a result, the
Company is no longer in default of its obligations to its Senior



                                       7
<PAGE>   10

Lender. The restructured credit facility is due and payable in monthly
installments with a final payment of all remaining obligations due on or before
December 31, 2000. Please refer to the Liquidity and Capital Resources section
of Item 2 for further discussion.

4.  RELATED-PARTY TRANSACTIONS:

Keystone Acquisition

In connection with the Company's acquisition of Keystone Rehabilitation Systems,
Inc., on November 15, 1995, Mr. Thomas Zaucha, Chairman and CEO of the Company,
and the Zaucha Family Limited Partnership, have debt and other amounts due
directly to them of $3,919,500 and $1,105,500, respectively, as of March 31,
2000. In addition, Mr. Zaucha and the Zaucha Family Limited Partnership have
other amounts due directly to them of $7,733,000 and $2,024,000, respectively,
as of March 31, 2000.

The Company also rents office and clinical space in buildings owned by the
Zaucha Family Limited Partnership and other related entities. Through March 31,
2000, the Company has incurred an expense of $122,465 related to rent due on
these spaces.

5.  COMMITMENTS AND CONTINGENCIES:

Zaucha Stock Guarantee

The Company guaranteed the value of certain stock issued to Mr. Zaucha and the
Zaucha Family Limited Partnership to be at least $5,600,000 through certain
periods ending no later than December 31, 1997. The Company has an obligation to
fund the shortfall in stock value through a cash payment equal to the shortfall
or, with shareholder approval, through the issuance of additional shares of
Common Stock in an amount equal to the shortfall. As of the December 31, 1997
final determination date, the Company was obligated to either make a cash
payment of $4,693,423 or issue approximately 4,888,982 additional shares of
Common Stock.

The Company presently does not have sufficient cash to meet its obligations
under this guarantee. This amount is recorded as a liability in accrued
expenses. At the Company's Annual Meeting held on June 11, 1998, the Company's
stockholders approved the issuance of up to 4,888,982 shares of Common Stock in
order to enable the Company to fully satisfy the obligations of the Company
under the guarantee in stock if deemed appropriate. The Company has not issued
any shares of Common Stock to Mr. Zaucha to satisfy this obligation.

Other

David D. Watson, former President of the Company has made claims against the
Company in relation to an Employment Agreement and Note. In 1999, a settlement
was reached between the Company and David D. Watson.

6.  MERGER AGREEMENT

On March 15, 2000, the Company signed an Agreement and Plan of Merger by and
among the Company, Benchmark Medical, Inc., a privately held Delaware
corporation ("BMI"), and Northstar Acquisition Corp., a Delaware corporation and
wholly-owned subsidiary of BMI ("NAC"), providing for the merger of NAC with and
into the Company with the Company being the surviving corporation (the
"Merger"), and pursuant to which each outstanding share of the Company's common
stock will be converted into the right to receive $1.50 in cash, without
interest, at the effect time of the Merger. The total transaction consideration
is approximately $36 million, which includes payments to stockholders and
repayment or assumption of certain obligations of the company. The transaction
is subject to certain closing conditions including expiration of the Hart-Scott
Rodino waiting period. The transaction is expected to close during the third
calendar quarter of this current year.


                                       8
<PAGE>   11

Item 2.

Management's Discussion and Analysis of Financial Condition and
Results of Operations

Information Relating to Forward-Looking Statements

Management's Discussion and Analysis and other sections of this Quarterly Report
include forward-looking statements that reflect the Company's current
expectations relating to such matters as anticipated financial performance,
business prospects, and projected plans for and results of its operations. A
variety of factors could cause the Company's actual results to differ materially
from the anticipated results or other expectations expressed in the Company's
forward looking statements. The risks and uncertainties that may affect the
operations and performance of the Company's business include the following:
changes in regulatory, governmental and payor policies regarding reimbursement;
competition, both directly in terms of other providers of physical therapy and
other services, and the competition for qualified personnel; the outcomes of the
current litigation involving the Company; defaults in borrowing arrangements,
defaults in bank financing, including an inability to comply with various
covenants in connection with such financing; the ability of the Company to have
its Common Stock relisted on the NASDAQ National Market System or listed on a
stock exchange; and the uncertainties surrounding the healthcare industry in
general.

Results of Operations

Restatements

The financial statements for the three months ended March 31, 1999 and 2000 have
been restated to correct an error in recording the Company's 49% ownership
interest in an outpatient clinic partnership. The Company had previously
consolidated this partnership since the Company controlled the operation of the
Partnership. These statements have been corrected to reflect the operations of
the partnership using the Equity Method of Accounting. This correction had no
effect on Net income or Shareholders' Equity of the Company.

Management fee operating expenses for the three months ended March 31, 1999 have
also been restated for better presentation with no effect on operating or net
income. Management fee expenses had previously been reported on a separate line
item in Operating Expenses. These costs have now been more properly included in
the appropriate expense categories, primarily Cost of Service and Selling,
general and administrative expenses.


The total of all restatements had no effect on Net Income for any of the periods
presented. However, Total Revenue decreased by $304,000 and $407,000 for the
three months ended March 31, 1999 and 2000, respectively. Total Operating
Expenses decreased by $278,000 and $93,000 for the same periods. Operating
Income for the three months ended March 31, 1999 and 2000 decreased by $57,000
and $176,000, respectively. Non-Operating expenses for the three months ended
March 31, 1999 and 2000, decreased $28,000 and $86,000 due to the restatements.
Income before Minority Interest and Minority Interest both decreased by $29,000
and $90,000 for the three months ended March 31, 1999 and 2000, respectively.
These restatements did not change Net Income.



                                       9
<PAGE>   12

     CONDENSED SUMMARY OF RESTATEMENTS FOR THREE MONTHS ENDED MARCH 31, 1999
<TABLE>
<CAPTION>
(In thousands)                              AS FILED         RESTATEMENTS            RESTATED
                                            --------         ------------            --------
<S>                                            <C>                  <C>                <C>
TOTAL REVENUE                                  6,983                (304)              6,679

GROSS PROFIT                                   3,914                (335)              3,579

TOTAL OPERATING EXPENSES                       3,260                (278)              2,982

OPERATING INCOME                                 654                 (57)                597

TOTAL NON-OPERATING EXPENSES                     501                 (28)                473

INCOME BEFORE MINORITY INTEREST                  167                 (29)                138

MINORITY INTEREST                                 91                 (29)                 62

NET INCOME                                        76                  --                  76

</TABLE>

     CONDENSED SUMMARY OF RESTATEMENTS FOR THREE MONTHS ENDED MARCH 31, 2000


<TABLE>
<CAPTION>
(In thousands)                              AS FILED         RESTATEMENTS            RESTATED
                                            --------         ------------            --------
<S>                                            <C>                   <C>                <C>
TOTAL REVENUE                                  7,897                 (407)              7,490

GROSS PROFIT                                   4,638                 (269)              4,369

TOTAL OPERATING EXPENSES                       2,998                  (93)              2,905

OPERATING INCOME                               1,640                 (176)              1,464

TOTAL NON-OPERATING EXPENSES                     496                  (86)                410

INCOME BEFORE MINORITY INTEREST                1,124                  (90)              1,034

MINORITY INTEREST                                227                  (90)                137

NET INCOME                                       897                   --                 897
</TABLE>


Three Months Ended March 31, 2000 and 1999

Total revenue

During the first quarter of 2000, the Company's total revenues increased by
$811,000, or 12.1%, from $6,679,000 for the first quarter of 1999 to $7,490,000
for the first quarter of 2000. The Company opened new outpatient offices and
entered into new contracts that resulted in an increase in net patient service
revenues of $519,000. Net patient service revenue from continuing operations
increased by $741,000 as a result of better weather conditions experienced in
January 2000 than in January 1999 and improved market penetration. Partially
offsetting these increases was a decrease in revenue of approximately


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<PAGE>   13

$137,000 as the result of the closure or termination of certain clinics and
contracts and a decline in management fee revenues of approximately $312,000 is
attributable to the termination of all mobile diagnostic services effective
August 13, 1999.

Costs of service and Gross profit

Costs of service increased $21,000 from $3,100,000 for the first quarter of 1999
to $3,121,000 for 2000, or .7% reflecting the increase in volume noted above. As
a percentage of net patient service revenue, costs of service decreased from
48.9% in the first quarter of 1999 to 41.8% in the first quarter of 2000 due to
the impact of ongoing cost reduction programs. As a result of these factors, and
the closing of the mobile diagnostic business in August 1999, gross profit
increased $790,000, from $3,579,000 (53.5% of total revenue) for the first
quarter of 1999 to $4,369,000 (58.3% of total revenue) for 2000.

Selling, general and administrative expense

Total selling, general and administrative expenses for the first quarter
increased $120,000 from $2,510,000 in 1999 to $2,630,000 in 2000. The 4.7%
increase is mainly due to increased lease costs and additional leases for new
facilities. Additional costs for more frequent Board of Directors meetings and
certain other costs also impacted SG&A expense.

Bad debt expense

The Company incurred a net bad debt credit of $22,000 during the first quarter
of 2000 versus $99,000 charge or approximately 1.6% of net patient revenue
during the first quarter of 1999. Bad debt expense in both years was reduced by
the recovery of contract billings deemed uncollectible in prior years. Bad debt
expense without any recoveries would have been approximately 1.0% and 2.9%,
respectively, in the first quarter of 2000 and 1999.

Interest and other non-operating expenses

Interest expenses were $497,000 for the first quarter of 2000 compared to
$503,000 for 1999. This decrease can be attributed to a reduction in the
principal balance for the senior debt offset somewhat by increases in the
effective interest rate.

Income taxes

The Company has recorded a tax provision of $20,000 during the first quarter of
2000 and none in 1999. As a result of the losses experienced in 1999 and prior
years, the Company anticipates that substantially all taxable income in 2000
will be offset by tax loss carryforwards.

Net income

The net income for the first quarter of 2000 was $897,000 compared to $76,000
for the same period in 1999. This significant increase in profitability is due
to improved net operating volume resulting, in part, from the elimination of
unprofitable operations of the Mobile Diagnostic service business which was
closed in 1999.

Liquidity and Capital Resources

On September 30, 1999, the Company restructured its credit facility with its
Senior Lender, Cerberus Capital Management, LLC, pursuant to the Restated Credit
Agreement. As a result, the Company is no longer in default of its obligations
to its Senior Lender. The restructured credit facility is due and payable in
monthly installments with a final payment of all remaining obligations due on or
before December 31, 2000.

During the three months ended March 31, 2000, $920,000 versus $1,220,000 of net
cash was provided by operating activities during the first three months of 1999
primarily due to increased net income offset by increases in accounts
receivables related to increased revenue and an increase in prepaid and other


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<PAGE>   14

current assets and a decrease in accounts payable during the period. The net
cash used in investing activities decreased from $181,000 in the first three
months of 1999 to $47,000 in the first three months of 2000 resulting primarily
from a decrease in capital expenditures.

During the first three months of 1999, the Company made debt principal payments
of $164,000 which primarily were scheduled debt and lease payments other than to
the Senior Lender, as well as, payments on debt to former owners and managers of
the Company. This amount increased to $1,127,000 for the first three months of
2000 due to principal payments made to the Senior Lender in accordance with the
Amended and Restated Credit Agreement. In addition, during the three months of
2000, the Company paid approximately $86,000 to minority interest holders in
companies controlled by Northstar and $9,000 under contractual obligations with
certain employees. During the first three months of 1999 and 2000, the Company
made no additional material borrowings under any debt arrangements.

Summary of Financial Condition and Results of Operations

The Company continues to experience problems with liquidity as a result of the
expenses related to the contest for corporate control in 1997; the investigation
and litigation expenses arising out of certain actions taken by the Company's
pre-1996 management; prior year's operating losses; and prior obligations to buy
out profit-sharing interests in several of the Company's key clinics. As a
result of these circumstances, the Company's access to the capital and debt
markets has been severely impaired. If it is unable to raise additional capital
and/or effect refinancing of its outstanding long-term debt obligations in the
foreseeable future, the Company could be required to file a petition for relief
under the provisions of the Bankruptcy Code.

In response to these developments, the Company continues to focus its efforts on
improving the performance of its core physical therapy and rehabilitation
businesses. During the third quarter of 1999, the Company negotiated the sale of
its Penn Vascusonics mobile diagnostic business, which had been unprofitable.
The Company is also continuing to review all expenses in an effort to reduce
costs wherever possible, and to seek additional sources of revenues. The
Company's Chairman continues to indicate that he will not demand immediate
reimbursement of all amounts currently due to him and his family partnership.

There can be no assurance that the Company will be successful in raising
additional equity or other capital, or that it will be in a position to do so on
terms that will not significantly dilute the equity interest of the Company's
existing stockholders. The Company is not currently eligible to utilize Form S-3
to register offerings of securities under the Securities Act of 1933, and its
shares are not currently listed on either the NASDAQ National Market or the
NASDAQ Small Cap Market. These circumstances could adversely affect the
Company's ability to attract additional equity capital.

Item 3.

Quantitative and Qualitative Disclosure About Market Risk Sensitive Instruments

The Company currently does not invest excess funds in derivative financial
instruments or other market risk sensitive instruments for the purpose of
managing its interest rate risk or for any other purpose.

Part II - OTHER INFORMATION

Item 1. - Legal Proceedings

On or about February 18, 1998 Robert J. Smallacombe, a former director, employee
and consultant of the Company commenced an action by filing a Praecipe for Writ
of Summons against the Company, Mr. Zaucha and other related parties. Mr.
Smallacombe believes he is entitled to the balance of his employment contract
and certain stock options that may or may not have been granted. The Company
believes that it has counterclaims against Mr. Smallacombe, and intends to
vigorously defend itself against any claims bought by Mr. Smallacombe. On March
17, 2000, Mr. Zaucha filed a petition with the Court seeking the dismissal of
the action because of Mr. Smallacombe's failure to prosecute same. On or


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<PAGE>   15

about March 29, 2000, Mr. Smallcombe filed a complaint, alleging breach of
contract and defamation, and seeking compensatory and punitive damages. On March
31, 2000, the Court of Common Pleas of Westmoreland County, Pennsylvania entered
a stay of the action pending the resolution of Mr. Zaucha's petition seeking
dismissal of the case.

Item 2. - Changes in Securities and Use of Proceeds

Chapter 1, Title 8, Section 170 of the Delaware Corporation Law provides that
the directors of every corporation may declare and pay dividends either out of
surplus or, in the event that there is no surplus, out of net profits for the
fiscal year in which the dividend is declared and/or the preceding fiscal year.
The Company has experienced a loss for fiscal year 1999 and a profit for the
first quarter of 2000, the Company has not had surplus during the past fiscal
year and does not have surplus during the first quarter of fiscal year 2000, and
therefore, the Company does not plan to declare and pay dividends on its Common
Stock.

In addition, the Company is prohibited from declaring any dividend, other than
dividends payable solely in common stock, on any shares of any class of stock
under the terms of the Restated Credit Agreement with its Senior Lender.


                                       13
<PAGE>   16




Item 6. - Exhibits and Reports on Form 8-K

(a)      Exhibits Required by Item 601 of Regulation S-K

         The following exhibits required by Item 601 of Regulation S-K are set
         forth in the following list and are filed either by incorporation or by
         reference from previous filings with the Securities and Exchange
         Commission or by attachment to this Form 10-Q.

3.1.1    Articles of Incorporation of Northstar Health Services, Inc., as filed
         in the state of Delaware, filed as an exhibit to the Company's Annual
         Report on Form 10-K for fiscal year ended December 31, 1996, is
         incorporated by reference.

3.1.2    Amendment to Certificate of Incorporation, as filed in the state of
         Delaware, filed as an exhibit to the Company's Quarterly Report on Form
         10-Q dated August 7, 1998, is incorporated by reference.

3.2.1    Bylaws of Northstar Health Services, Inc., filed as an exhibit to the
         Company's Quarterly Report on Form 10-Q dated August 14, 1997, is
         incorporated by reference.

3.2.2    Amendment to the Bylaws of Northstar Health Services, Inc., filed as an
         exhibit in the Company's Form 8-K, dated September 1, 1998, is
         incorporated by reference.

4.1      1997 Stock Option Plan, filed as an exhibit to the Company's Annual
         Report on Form 10-K for fiscal year ended December 31, 1997, is
         incorporated by reference.

4.2      1992 Stock Option Plan, as amended, filed as an exhibit to the
         Company's Annual Report on Form 10-K for fiscal year ended December 31,
         1996, is incorporated by reference.

4.3      Form S-8 Registration Statement (No. 33-94584), 1992 Stock Option Plan
         filed July 14, 1995, is incorporated by reference.

4.4      Form S-8 Registration Statement (No. 333-57051), 1997 Stock Option Plan
         filed June 17, 1998, is incorporated by reference.

4.5      Post Effective Amendment No. 1 to Form S-8 Registration Statement (No.
         33-94584), 1994 Stock Option Plan, filed June 17, 1998, is incorporated
         by reference.

10.1     Employment Agreement dated November 15, 1995, between Northstar Health
         Services, Inc. and Thomas W. Zaucha, filed as an exhibit to the
         Company's Form 8-K dated November 15, 1995, is incorporated by
         reference.

10.2     Amended and Restated Credit Agreement.

10.3     Amended and Restated Promissory Note: Cerberus Capital Management, LLC.

10.4     Amended and Restated Promissory Note:  Bear Stearns & Co.

10.5     Amended and Restated Company Security Agreement.

10.6     Amended and Restated Subsidiaries Guaranty.

10.7     Amended and Restated Company Pledge Agreement.

10.8     Amended and Restated Subsidiaries Stock Pledge Agreement.

10.9     Amended and Restated Subsidiaries Security Agreement.


                                       14
<PAGE>   17

10.10    Zaucha Subordination Agreement

10.11    Zaucha Payment Letter.

10.12    Warrant to Purchase Shares of Common Stock.

23       Consent of Counsel dated August 14, 2000

27       Financial Data Schedule


(b)      Reports on Form 8-K

99       Opinion of Counsel dated March 23, 1998

99       Form 8-K, dated March 6, 2000, Item 5 "Other Events" reported.

99       Form 8-K, dated March 20, 2000, Item 5 "Other Events" reported.

99       Form 8-K, dated June 30, 2000, Item 5 "Other Events" reported.



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<PAGE>   18



                                   SIGNATURES

In accordance with 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.

Northstar Health Services, Inc.
(Registrant)



By:  /s/ Thomas W. Zaucha
    --------------------------
Thomas W. Zaucha
Chairman of the Board, President and Chief Executive Officer
(Principal Executive Officer)
Date: August 18, 2000


By:  /s/ James R. Martin
    ---------------------------
James R. Martin
Executive Vice President and Chief Financial Officer
and Treasurer
(Principal Accounting and Financial Officer)
Date: August 18, 2000