Document:

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                    [LETTERHEAD OF WILLIAM BLAIR & COMPANY]

                                                                   Exhibit 10.12

                                 July 17, 2001

Mr. Phillip S. Dingle
Chief Executive Officer
PlanVista Corporation
PO Box 30098
Tampa, FL 33630-3098

Dear Phillip:

This is to confirm the additional engagement of William Blair & Company, L.L.C.
("Blair") by PlanVista Corporation (the "Company") to render certain investment
banking services in connection with a possible business combination (through
tender offer, merger, sale or exchange of 50% or more of the outstanding capital
stock of the Company to persons who are not owners of more than 10% of the
Company's common stock as of the date of this letter, or sale of all or
substantially all of its assets or otherwise) of the Company with another party
or a recapitalization of the Company or similar restructuring (the "Possible
Transaction").  This letter is intended to broaden the scope of the engagement
defined as the April 19, 2001, letter agreement between the Company and Blair.

The foregoing notwithstanding, Blair acknowledges that if Bank of America Corp
                                                          --------------------
and/or any of its subsidiaries provide a firm commitment to fund the senior bank
------------------------------
credit facility and any of the subordinated debt and such commitment is
delivered to the Company on or before August 10, 2001.  Then Blair's Debt
Placement Fee and Debt Restructuring Fee, as contemplated in our April 19, 2001
letter agreement, shall not exceed $250,000.

Notwithstanding the foregoing, Blair will also receive a Debt Placement Fee,
payable at closing, for any debt financing placed by Blair.

     1.   Services to Be Rendered.  Blair will perform such of the following
          -----------------------
          services in connection with the Possible Transaction as the Company
          may reasonably request:

          a.   Blair will familiarize itself to the extent it deems appropriate
               with the business, operations, financial condition and prospects
               of the Company;

          b.   Blair will assist the Company's management in (i) developing a
               strategy for pursuing a Possible Transaction involving the
               Company and a list of possible participants in the Possible
               Transaction (it being understood that such participants may
               include parties to whom Blair has rendered or is now rendering
               investment banking services), (ii) preparing a descriptive
               memorandum that describes the Company's operations and financial
               condition and includes current financial data and other
               appropriate information furnished by the Company (as amended and
               supplemented from time to time, the "Descriptive Memorandum") and
               (iii) contacting and eliciting interest from those possible
               participants expressly approved by the Company;
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                                      -2-

          c.   Blair will participate with the Company and its counsel in
               negotiations relating to the Possible Transaction, and in
               coordinating the due diligence and closing process of any
               Possible Transaction;

          d.   Blair will participate in meetings of the Board of Directors of
               the Company (such participation to be in person or by telephone,
               as appropriate) at which the Possible Transaction is to be
               considered and, as appropriate, will report to the Board of
               Directors with respect thereto; and

          e.   If requested, Blair will (i) render an opinion (the "Opinion")
               (such Opinion will be in writing if requested by the Company ),
               as to the fairness, from a financial point of view, to the
               Company's common stockholders of the consideration to be received
               by such stockholders or the exchange ratio, as the case may be,
               in the Possible Transaction or (ii) advise the Board of Directors
               that Blair is unable to render an Opinion due to the inadequacy
               of such consideration.  The Opinion will be in such form and with
               such qualifications as determined appropriate by Blair.

          In connection with Blair's activities on the Company's behalf, the
          Company agrees to cooperate with Blair and will furnish to, or cause
          to be furnished to, Blair all information and data concerning the
          Company, any Possible Transaction and any possible participant (the
          "Information") which Blair reasonably deems appropriate and will
          provide Blair with access to the Company's officers, directors,
          employees and advisors.  The Company represents and warrants that all
          Information made available to Blair by the Company with respect to a
          Possible Transaction will be complete and correct and that any
          projections, forecasts or other Information provided by the Company to
          Blair or to any possible participant, any other party to a Possible
          Transaction, or contained in the Descriptive Memorandum will have been
          prepared in good faith and will be based upon reasonable assumptions.
          The Company agrees to promptly notify Blair if the Company believes
          that any Information which was previously provided to Blair or to any
          possible participant has become materially misleading.  The Company
          acknowledges and agrees that, in rendering its services hereunder,
          including, without limitation, assisting the Company's management in
          the preparation of the Descriptive Memorandum, Blair will be using and
          relying on the Information (and information available from public
          sources and other sources deemed reliable by Blair) without
          independent verification thereof or independent appraisal of any of
          the Company's assets or those of any possible participant.
          Furthermore, in evaluating each possible participant, Blair will be
          using information contained in public reports and possibly other
          information furnished to Blair by such possible participant.  Blair
          does not assume responsibility for the accuracy or completeness of the
          Information or any other information regarding the Company, any
          possible participant or any Possible Transaction.  If all or any
          portion of the business of the Company or any possible participant is
          engaged in through subsidiaries or other affiliates, the references in
          this letter agreement to the Company or the possible participant will,
          when appropriate, be deemed also to include such subsidiaries or other
          affiliates.

          In order to coordinate most effectively our efforts together to effect
          a Possible Transaction satisfactory to the Company, the Company and
          its management will promptly inform us of any inquiry they may receive
          concerning the availability of all or a
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                                      -3-

          portion of the stock or assets of the Company for purchase. Also,
          during the period of our engagement, neither the Company nor its
          management will initiate any discussions looking toward the sale of
          all or a portion of the stock or assets of the Company without
          informing Blair.

          The Company and Blair will each have the right to approve the
          Descriptive Memorandum and, to the extent relevant to or otherwise
          affecting Blair's services to be provided hereunder, other written
          communication from the Company or any person acting on its behalf in
          connection with the Possible Transaction.

          It is further understood that any advice rendered by Blair pursuant to
          its engagement hereunder, including any advice rendered during the
          course of participating in negotiations and meetings of the Board of
          Directors (or a Special Committee thereof) of the Company, as well as
          any written Opinion rendered and any written materials provided by
          Blair, will be solely for the benefit and confidential use of the
          Board of Directors (or a Special Committee thereof) and will not be
          reproduced, summarized, described or referred to or given to any other
          person for any purpose without Blair's prior written consent.

     2.   Fees.  The Company agrees to pay Blair a fee of $250,000 promptly
          ----
          after Blair at the Company's request (i) advises the Board of
          Directors (or a Special Committee thereof) in a written opinion as to
          the fairness, from a financial point of view, to the Company's
          stockholders of the consideration to be received by such stockholders
          or the exchange ratio, as the case may be, with respect to the
          Possible Transaction or (ii) advises that it is unable to render an
          opinion to such effect.  In the event that the Possible Transaction is
          consummated, the Company will pay or cause to be paid to Blair a fee
          equal to 2.0% of the total consideration received by the Company and
          its stockholders as a result of such consummation (the "Transaction
          Consideration"), subject to a minimum fee of $750,000 and a maximum
          fee of $2.0 million.

          For purposes of this letter agreement, the term "Transaction
          Consideration" will mean the total amount of cash and the fair market
          value of all securities or other property paid or payable directly or
          indirectly to the Company or any of its security holders in connection
          with a Possible Transaction which is consummated, including, without
          limitation, (i) amounts paid (A) pursuant to covenants not to compete,
          employment contracts, employee benefit plans or other similar
          arrangements (B) to holders of any warrants or convertible securities
          of the Company and (C) to holders of any options or stock appreciation
          rights issued by the Company, whether or not vested; (ii) the total
          amount of indebtedness for borrowed money or similar non-trade
          liabilities or obligations (including pension liabilities, guarantees,
          capitalized or operating leases and the like) of the Company repaid,
          retired, extinguished or assumed in connection with the Possible
          Transaction, or which otherwise remains outstanding with the Company
          or any affiliate thereof as of the closing of a Possible Transaction
          or which is assumed by the acquiror or an affiliate thereof; and (iii)
          in the case of a sale of substantially all the Company's assets, the
          total consideration paid for such assets plus the net value of any
          current assets not sold by the Company.
<PAGE>

                                      -4-

          Amounts paid into escrow in connection with any Possible Transaction
          will also be included as part of the Transaction Consideration and the
          portion of Blair's fee related to such escrow payments will be payable
          upon the establishment of such escrow.  Transaction Consideration also
          will include the aggregate amount of any dividends or other
          distributions declared by the Company with respect to its stock after
          the date hereof, other than normal recurring cash dividends in amounts
          not materially greater than currently paid.

          The fee payable to Blair upon consummation of a transaction involving
          a tender offer or other purchase or sale of stock will become payable
          by the Company when control of 50% or more of the Company's
          outstanding common stock is acquired by an entity other than a current
          stockholder.  In that event, such Transaction Consideration will be
          calculated under the above definition of aggregate Transaction
          Consideration as though 100% of the outstanding common stock on a
          fully diluted basis had been acquired for the highest per share amount
          paid in the transaction in which control is acquired.  Nevertheless,
          our services pursuant to this letter agreement will continue after
          control is obtained to assist you with a second step merger, if any,
          or similar transaction.

          If any portion of the Transaction Consideration is paid in the form of
          securities for which a public trading market existed prior to
          consummation of the Possible Transaction, the value of such
          securities, for purposes of calculating the Transaction Consideration,
          will be determined by the closing or last sales price for such
          securities on the last trading day prior to the consummation or
          effectiveness of the Possible Transaction.  If such securities do not
          have an existing public trading market, the value of the securities
          will be the mutually agreed upon fair market value on the day prior to
          the consummation of the Possible Transaction; provided that promissory
          notes or other debt obligations will be valued at the face amount
          thereof.

          The fee payable to Blair upon consummation of the Possible Transaction
          will be payable in full, in cash, upon the closing of the Possible
          Transaction or such earlier date as set forth above; provided,
          however, that if the value of the Transaction Consideration includes
          consideration the receipt of which is contingent upon the passage of
          time (other than the establishment of an escrow which shall be paid as
          described in the paragraph dealing with escrow above) or the
          occurrence of some future event or circumstance ("Contingent Value"),
          the portion of Blair's fee related to the Transaction Consideration
          attributable to such Contingent Value will be paid to Blair at the
          earlier of (x) the date on which payment of such Contingent Value is
          due or (y) the time that such Contingent Value can be determined.

     3.   Expenses.  The Company will reimburse Blair for all out-of-pocket
          --------
          expenses (including fees and expenses of its counsel and any other
          independent experts retained by Blair) reasonably incurred by it in
          connection with its engagement hereunder.  Such reimbursement will be
          payable within 30 days after submission by Blair of statements to the
          Company.
<PAGE>

                                      -5-

     4.   Indemnification.  Blair and the Company have entered into a separate
          ---------------
          indemnity agreement, dated the date hereof (the "Indemnity
          Agreement"), providing among other things for the indemnification of
          Blair by the Company in connection with Losses and Expenses (as
          defined in the Indemnity Agreement) in connection with Blair's
          engagement hereunder.  The terms of the Indemnity Agreement are
          incorporated by reference into this letter agreement.

     5.   Termination.  Blair's engagement hereunder may be terminated by either
          -----------
          the Company or Blair, with or without cause, upon written notice to
          the other party; provided, however, that (a) no such termination will
          affect Blair's right to expense reimbursement under Section 3, the
          payment of any accrued and unpaid fees pursuant to Section 2, the
          indemnification contemplated by Section 4 or the Indemnity Agreement
          and (b) if the Company, directly or indirectly, consummates any
          Possible Transaction within twelve months following such termination
          with any party (i) which Blair has identified and contacted, (ii) in
          respect of which Blair has rendered advice, or (iii) with which the
          Company has directly or indirectly held discussions prior to such
          termination, then Blair will be entitled to the full amount of the fee
          contemplated by Section 2.

     6.   Governing Law; Jurisdiction; Waiver of Jury Trial. This letter
          -------------------------------------------------
          agreement and the Indemnity Agreement will be deemed made in Illinois
          and will be governed by the laws of the State of Illinois.  The
          Company irrevocably submits to the jurisdiction of any court of the
          State of Illinois or the United States District Court of the Northern
          District of the State of Illinois for the purpose of any suit, action
          or other proceeding arising out of this letter agreement or the
          Indemnity Agreement, or any of the agreements or transactions
          contemplated hereby, which is brought by or against the Company.  Each
          of the Company (and, to the extent permitted by law, on behalf of the
          Company's equity holders and creditors) and Blair hereby knowingly,
          voluntarily and irrevocably waives any right it may have to a trial by
          jury in respect of any claim based upon, arising out of or in
          connection with the Indemnity Agreement, this letter agreement and the
          transactions contemplated hereby (including, without limitation, any
          Possible Transaction).

     7.   No Rights in Equityholders, Creditors.  This letter agreement does not
          -------------------------------------
          create, and will not be construed as creating, rights enforceable by
          any person or entity not a party hereto, except those entitled thereto
          by virtue of the Indemnity Agreement.  The Company acknowledges and
          agrees that (i) Blair will act as an independent contractor and is
          being retained solely to assist the Company in its efforts to effect a
          Possible Transaction and that, other than as expressly stated in any
          Opinion, Blair is not being retained to advise the Company on, or to
          express any opinion as to, the wisdom, desirability or prudence of
          consummating a Possible Transaction, (ii) Blair is not and will not be
          construed as a fiduciary of the Company or any affiliate thereof and
          will have no duties or liabilities to the equityholders or creditors
          of the Company, any affiliate of the Company or any other person by
          virtue of this letter agreement and the retention of Blair hereunder,
          all of which duties and liabilities are hereby expressly waived and
          (iii) any Opinion or advice rendered by Blair does not constitute a
          recommendation to any equityholder that such equityholder might or
          should take in connection with the Possible Transaction.  Neither
          equityholders nor creditors of the Company are intended beneficiaries
          hereunder.
<PAGE>

                                      -6-

     8.   Blair; Other Advisors.  It is understood and agreed that Blair may,
          ---------------------
          from time to time, make a market in, have a long or short position in,
          buy and sell or otherwise effect transactions for customer accounts
          and for their own accounts in the securities of, or perform investment
          banking or other services for, the Company and other entities which
          are or may be the subject of the engagement contemplated by this
          letter agreement.  The Company confirms that it will rely on its own
          counsel, accountants and other similar expert advisors for legal,
          accounting, tax and other similar advice.

     9.   Other.  The Company agrees that it will not enter into an agreement
          -----
          with respect to a Possible Transaction involving a sale of all or
          substantially all of the Company's assets or operations, unless such
          agreement expressly provides for the unconditional assumption of the
          Company's obligations to Blair under this letter agreement and the
          Indemnity Agreement.  This letter agreement may not be modified or
          amended except in writing executed by the parties hereto.  This letter
          agreement, and any modification or amendment thereto, may be executed
          in counterparts, each of which will be deemed an original and all of
          which will constitute one and the same instrument.

If the foregoing correctly sets forth our agreement, please so indicate by
signing below and returning an executed copy to us.  We look forward to working
with you.

                                   Very truly yours,

                                   WILLIAM BLAIR & COMPANY, L.L.C.

                                   By: /s/ Kelly J. Martin                    .
                                      -----------------------------------------

ACCEPTED AND AGREED AS OF
THE DATE FIRST ABOVE WRITTEN

PLANVISTA CORPORATION

By: /s/ Phillip S. Dingle     .
    ---------------------------
<PAGE>

                             PlanVista Corporation
                                  PO Box 30098
                             Tampa, FL 33630-3098

                                 July 17, 2001

William Blair & Company,  L.L.C.
222 West Adams Street
Chicago IL 60606

Gentlemen:

In connection with your engagement by PlanVista Corporation (the "Company")
pursuant to the letter agreement of even date herewith (the "Engagement
Letter"), as the same may be modified or amended from time to time hereafter,
the Company hereby agrees to indemnify and hold harmless William Blair &
Company, L.L.C. ("Blair") and each of the Other Indemnified Parties (as defined
below) to the fullest extent permitted by law, from and against any and all
losses, claims, damages, obligations, penalties, judgments, awards, costs,
disbursements and liabilities (including amounts paid in settlement)
(collectively, "Losses") and expenses (including, without limitation, all fees
and expenses of Blair's and each of the Other Indemnified Parties' counsel and
all of Blair's and each of the Other Indemnified Parties' reasonable travel and
other out-of-pocket expenses incurred at the Company's request or otherwise
incurred in connection with the investigation of any pending or threatened
claims or the preparation for, the defense of, or the furnishing of evidence in,
any pending or threatened litigation, investigation or proceedings, whether or
not Blair or any Other Indemnified Party is a party thereto) (collectively,
"Expenses") based upon, arising out of or in any way relating to (a) oral or
written information provided by the Company to Blair or any party to a Possible
Transaction (as defined in the Engagement Letter), (b) action by the Company or
action by Blair at the request of the Company or with the Company's consent, (c)
any Possible Transaction or any Opinion (as defined in the Engagement Letter) or
(d) Blair's engagement under the Engagement Letter; provided that the Company
will have no obligation to indemnify and hold harmless Blair or any of the Other
Indemnified Parties pursuant to this clause (d) in respect of any Losses or
Expenses which are finally judicially determined to have resulted primarily and
directly from the gross negligence or bad faith of Blair in fulfilling its
duties under the Engagement Letter.  Expenses will be reimbursed or advanced
when and as incurred promptly upon submission by Blair of statements to the
Company.  The Other Indemnified Parties will mean and include (i) Blair's
affiliates, (ii) the respective members, principals, partners, directors,
officers, agents and employees of and counsel to Blair and its affiliates, (iii)
each other person, if any, controlling Blair or any of its affiliates and (iv)
the successors, assigns, heirs and personal representatives of any of the
foregoing.

If any litigation, investigation or proceeding is commenced as to which Blair
proposes to demand indemnification, Blair will notify the Company with
reasonable promptness; provided, however, that any failure by Blair to notify
the Company will relieve the Company from its obligations hereunder only to the
extent the Company has been prejudiced by such failure or delay.  Blair will
have the right to retain counsel (and local counsel, if appropriate) of its own
choice to represent it, and the Company will pay the reasonable fees, expenses
and disbursements of such counsel.  The

<PAGE>

PlanVista                             -2-                          July 17, 2001

Company retains the right to participate in the defense of such litigation,
investigation or proceeding as to which Blair seeks indemnification through
counsel of the Company's choice (the cost of which will be paid by the Company)
and Blair will reasonably cooperate with such counsel and the Company
(including, to the extent possible and consistent with its own interests,
keeping the Company reasonably informed of such defense). The Company will be
liable for any settlement of any claim against Blair made with the Company's
written consent, which consent will not be unreasonably withheld.

If, for any reason, the foregoing indemnification is unavailable to Blair or any
of the Other Indemnified Parties or is insufficient to hold them harmless in
respect of any Losses or Expenses, then the Company will contribute to the
amount paid or payable by Blair or any of the Other Indemnified Parties as a
result of such Losses and Expenses in such proportion as is appropriate to
reflect the relative benefits (or anticipated benefits) to the Company and its
stockholders on the one hand and Blair and the Other Indemnified Parties on the
other hand from the Possible Transaction, or if such allocation is not permitted
by applicable law, then in such proportion as is appropriate to reflect not only
the relative benefits received by the Company and its stockholders on the one
hand and Blair and the Other Indemnified Parties on the other hand, but also the
relative fault of the Company, its directors, officers, employees, agents and
advisers (other than Blair) on the one hand and Blair and the Other Indemnified
Parties on the other hand, as well as any other relevant equitable
considerations.  The relative benefits received (or anticipated to be received)
by the Company and its stockholders on the one hand and by Blair and the Other
Indemnified Parties on the other hand will be deemed to be in the same
proportion as the Transaction Consideration (as defined in the Engagement
Letter) bears to the total fees paid to Blair pursuant to the Engagement Letter.
The relative fault of any party or other person will be determined by reference
to such party's or person's knowledge, access to information and opportunity to
prevent or correct any misstatement, omission, misconduct or breach of duty.  In
no event will the amount required to be contributed by Blair and the Other
Indemnified Parties hereunder exceed the total amount of fees paid to Blair
pursuant to the Engagement Letter.  You and we agree that it would not be just
and equitable if contribution were determined by pro rata allocation or by any
other method of allocation which does not take account of the equitable
considerations referred to above.

The reimbursement, indemnity and contribution obligations of the Company
hereunder will (i) be in addition to any liability which the Company may
otherwise have, (ii) survive the completion or termination of Blair's engagement
under the Engagement Letter and (iii) shall be binding upon any successors and
assigns of the Company.

In the event that any litigation, investigation or proceeding relating to the
transaction contemplated by the Engagement Letter is commenced or threatened
against the Company, the Company will not settle any such pending or threatened
litigation, investigation or proceeding unless (i) Blair, by name, and the Other
Indemnified Parties, by description, are included in any release or settlement
agreement, whether or not Blair and the Other Indemnified Parties are named as
defendants in such litigation or proceeding, (ii) Blair and the Other
Indemnified Parties are unconditionally released from all claims and liabilities
asserted or which could have been asserted in such litigation, investigation or
proceeding and (iii) there is no statement in any such release or settlement
agreement as to an admission of fault, culpability or failure to act by or on
behalf of Blair or the Other Indemnified Parties.

This Indemnity Agreement will be deemed made in Illinois.  The validity and
interpretation of this Indemnity Agreement will be governed by, and construed
and enforced in accordance with, the laws of the State of Illinois applicable to
agreements made and to be fully performed therein

<PAGE>

PlanVista                             -3-                          July 17, 2001

(excluding the conflicts of laws rules). The Company irrevocably submits to the
jurisdiction of any court of the State of Illinois or the United States District
Court of the Northern District of the State of Illinois for the purpose of any
suit, action or other proceeding arising out of this Indemnity Agreement which
is brought by or against the Company. Each of the Company (and, to the extent
permitted by law, on behalf of the Company's equity holders and creditors) and
Blair hereby knowingly, voluntarily and irrevocably waives any right it may have
to a trial by jury in respect of any claim based upon, arising out of or in
connection with this Indemnity Agreement.

This Indemnity Agreement may not be modified or amended except in writing
executed by the parties hereto.  This Indemnity Agreement, and any modification
or amendment thereto, may be executed in counterparts, each of which will be
deemed an original and all of which will constitute one and the same instrument.

                                             Very truly yours,

                                             PLAN VISTA CORPORATION

                                             By:           /s/ Phillip S. Dingle
                                                --------------------------------
                                                Name: Phillip S. Dingle
                                                Title: CEO

Agreed and accepted as of
the date above.

WILLIAM BLAIR & COMPANY, L.L.C.

By:                   /s/ Kelly J. Martin
   --------------------------------------
   Name: Kelly J. Martin
   Title: Principal<PAGE>

                                                                   Exhibit 10.13

                               SUBLEASE AGREEMENT

     THIS SUBLEASE AGREEMENT (the "Sublease") is made and entered into this
18th day of June, 2001, by and between HEALTHPLAN SERVICES, INC., a Florida
corporation ("Sublessor") and PLANVISTA CORPORATION, a Delaware corporation
("Sublessee").

     1.   BASIC PROVISIONS.
          ----------------

          A. Property Address: 3501 Frontage Road, Tampa, Florida (the property
     located at this address shall hereinafter be referred to as "Building #1").

          B. Description of Sublease Premises (the "Sublease Premises"):
     Approximately 22,583 square feet consisting of the approximately 24,943
     square foot third floor of the Building #1, less the approximately 540
     square foot copy center (the "Copy Center"), and less the approximately
     1,820 square foot Mt. Billion conference room ("Mt. Billion")

          C. Sublessee's Address for Notices: 3501 Frontage Road, Tampa, Florida
     33607, Attn: Phil Dingle.

          D. Sublessor's Address for Notices and Sublease Rent: 3501 Frontage
     Road, Tampa, Florida 33607, Attn: Jeff Bak; with copy of Notices to:
     HealthPlan Holdings, Inc. 5200 Town Center Circle, Suite 470, Boca Raton,
     Florida 33486 Attn: Marc J. Leder, Rodger R. Krause, and C. Deryl Couch.

          E. Prime Landlord (the "Prime Landlord"): Colonial Properties Trust

          F. Prime Landlord's Address for Notices: 2101 6th Avenue North, Suite
     750, Birmingham, Alabama 35202, Attn: Trudy Butler; with copy to: 605
     Crescent Executive Court, Suite 300, Lake Mary, Florida 32746, Attn: Tom
     Green.

          G. Identification of Prime Lease (the "Prime Lease"):

     Lease for Building #1, by and between Paragon Group, Inc., as agent for
     Airport Southeast Associates, Ltd., a Florida limited partnership, and Plan
     Services, Inc., a Florida corporation, dated January 26, 1982.

     Lease for property located at 3503 Frontage Road, Tampa, Florida ("Building
     #2"), by and between Paragon Group, Inc., as agent for Airport Southeast
     Associates, Ltd., a Florida limited partnership, and Plan Services, Inc., a
     Florida corporation, dated January 26, 1982.

     Amendment of Lease by and between Paragon Group, as agent for Airport
     Southeast Associates, Ltd., a Florida limited partnership, and Plan
     Services, Inc., a Florida corporation, dated October 13, 1983.
<PAGE>

     Second Amendment to Leases (the "Second Amendment") by and between
     Concourse Center Associates Limited Partnership, a District of Columbia
     limited partnership and HealthPlan Services, Inc., dated April 30, 1995.

          H. Sublease Commencement Date (the "Commencement Date") : The date on
     which the last of Sublessor and Sublessee executes this Sublease.

          I. Sublease Expiration Date (the "Expiration Date"): The date one year
     after the Commencement Date.

          J. Sublessee's Use: General office use.

     2.   PRIME LEASE. Sublessor is the tenant under the Prime Lease with the
          -----------
Prime Landlord.

     3.   SUBLEASE. Sublessor, for and in consideration of the rents herein
          --------
reserved and of the covenants and agreements herein contained on the part of the
Sublessee to be performed, hereby subleases to the Sublessee, and the Sublessee
accepts from the Sublessor, use of the Sublease Premises, throughout the Term.

     4.   TERM. The term (the "Term") of this Sublease shall begin on the
          ----
Commencement Date and shall end on the Expiration Date.

     5.   POSSESSION. Sublessor agrees to deliver, and Sublessee agrees to
          ----------
accept, possession of the Sublease Premises on the Commencement Date in their
condition as of the Commencement Date.

     6.   SUBLESSEE'S USE. The Sublease Premises shall be used and occupied only
          ---------------
for the Sublessee's Use set forth above.

     7.   SUBLEASE RENT. Beginning on the Commencement Date, Sublessee agrees to
          -------------
pay monthly installments of rent (the "Sublease Rent") to the Sublessor at the
address specified above, or to such other payee or at such other address as may
be designated by notice in writing from Sublessor to Sublessee, without prior
demand therefor and without any deduction whatsoever. Sublease Rent shall be
$10.75 per square foot of the Sublease Premises per annum (89.58 cents per
square foot of the Sublease Premises per month), and shall be payable by
Sublessee in monthly installments, in advance, on the first day of each calendar
month of the Term. Sublessor and Sublessee acknowledge that the Sublease Rent is
equal to the rent per square foot which is payable by Sublessor to the Prime
Landlord under the Prime Lease; Sublessor and Sublessee agree that Sublease Rent
shall increase in the event that the rent payable by Sublessor to the Prime
Landlord under the Prime Lease increases. Sublessee's covenant to pay Sublease
Rent shall be independent of every other covenant in this Sublease.
<PAGE>

     8.   SUBLEASE OPERATING EXPENSES AND SERVICES PROVIDED BY PRIME LANDLORD.
          -------------------------------------------------------------------
Beginning on the Commencement Date, Sublessee agrees to pay operating expenses
(the "Sublease Operating Expenses") to the Sublessor at the address specified
for the payment of Sublease Rent. Sublease Operating Expenses shall be
Sublessee's pro-rata share, based upon the square footage of the Sublease
Premises, of the Operating Expenses (as defined in the Prime Lease) for Building
#1 payable by Sublessor to Prime Landlord under the Prime Lease. Sublease
Operating Expenses shall be due and payable by Sublessee as the Operating
Expenses payable by Sublessor to Prime Landlord become due and payable without
prior demand therefor and without any deduction whatsoever. Sublessee shall be
entitled to all services to the Building and the Sublease Premises which are
provided by the Prime Landlord under the Prime Lease.

     9.   REAL ESTATE TAXES. Sublessee shall pay real estate taxes (the
          -----------------
"Sublease Real Estate Taxes") to the Sublessor at the address specified for the
payment of Sublease Rent. Sublease Real Estate Taxes shall be Sublessee's pro-
rata share, based upon the square footage of the Sublease Premises, of the Real
Estate Taxes (as defined in the Prime Lease) for Building #1 payable by
Sublessor to the Prime Landlord under the Prime Lease. Sublease Real Estate
Taxes shall be due and payable by Sublessee as the Real Estate Taxes payable by
Sublessor to Prime Landlord become due and payable, without prior demand
therefor and without any deduction whatsoever.

     10.  AMENDMENT TO PRIME LEASE. If Sublessor and Prime Landlord enter into
          ------------------------
amendments to the Prime Lease after the Commencement Date of this Sublease, the
sums payable hereunder for Sublease Rent, Sublease Operating Expenses, and
Sublease Real Estate Taxes, shall based upon the Prime Lease as it is amended,
provided that, prior to December 31, 2001, Sublessor shall not enter into any
amendment to the Prime Lease which materially affects the Sublease Premises or
services to the Sublease Premises which are provided under this Sublease.

     11.  PRORATION OF SUBLEASE RENT AND OPERATING EXPENSES. Anything to the
          -------------------------------------------------
contrary contained herein notwithstanding, if the Commencement Date is a date
other than the first day of a calendar month, all sums payable by Sublessee
under this Sublease (including Sublease Rent, Sublease Operating Expenses, and
Sublease Real Estate Taxes) shall be prorated in an equitable manner based upon
the number of days in the calendar month during which this Sublease is in
effect.

     12.  POST-COMMENCEMENT DATE OCCUPANCY BY SUBLESSOR. Sublessor shall
          ---------------------------------------------
completely vacate the Sublease Premises within 30 days after the Commencement
Date. Anything to the contrary contained herein notwithstanding, Sublessee shall
receive a discount (the "Occupancy Discount") in any payments of Sublease Rent,
Sublease Operating Expenses, Sublease Real Estate Taxes, or electricity costs,
at any time during which Sublessor occupies any portion of the Sublease
<PAGE>

Premises. The Occupancy Discount shall be a percentage equal to the percentage
of square feet of the Sublease Premises which are occupied by Sublessor on the
date any payment by Sublessee to Sublessor becomes due.

     13.  SUBLESSOR USE OF MT. BILLION AND COPY CENTER. Anything to the contrary
          --------------------------------------------
contained in this Sublease notwithstanding, Sublessor shall have the right to
enter the Sublease Premises to the extent necessary to access Mt. Billion and
the Copy Center; and such entry shall not constitute a breach of the covenant of
quiet enjoyment set forth below.

     14.  OBLIGATION TO VACATE PREMISES PRIOR TO EXPIRATION DATE. Anything to
          ------------------------------------------------------
the contrary contained herein notwithstanding, Sublessee shall completely vacate
the Sublease Premises by midnight on December 31, 2001. This obligation to
vacate the Sublease Premises shall have no effect on Sublessee's obligation to
pay Sublease Rent, Sublease Operating Expenses, Sublease Real Estate Taxes, or
electricity costs.

     15.  QUIET ENJOYMENT. Sublessor represents that it has full power and
          ---------------
authority to enter into this Sublease, subject to the consent of the Prime
Landlord, if required under the Prime Lease. Until midnight on December 31,
2001, so long as Sublessee is not in default in the performance of its covenants
and agreements in this Sublease, Sublessee shall be entitled to quiet and
peaceable enjoyment of the Sublease Premises shall not be disturbed or
interfered with by Sublessor, or by any person claiming by, through, or under
Sublessor.

     16.  PARKING SPACES. Sublessee shall be entitled to a pro-rata share, based
          --------------
upon the square footage of the Sublease Premises, of the parking spaces provided
to Sublessor under the Prime Lease. The parking spaces provided to Sublessee
shall include five (5) reserved executive parking spaces, which shall be located
to the right of the entrance to Building #2, in the block of executive spaces
existing as of the Commencement Date.

     17.  ELECTRICITY. Sublessor shall provide electricity to the Sublease
          -----------
Premises. Sublessee shall pay 73% of Sublessee's pro-rata share, based upon the
square footage of the Sublease Premises, of the cost of electricity paid by
Sublessor for Building #1. Sublessor and Sublessee agree that this percentage
takes into account the percentage of electricity used by Building #1 which is
attributable to the computer center located in Building #1. Sublessee shall have
the right to install a separate check meter to register electricity used by the
Sublease Premises, and upon such installation, to pay the actual cost of the
electricity used by the Sublease Premises.

     18.  SUBLESSEE'S INSURANCE. Sublessee shall procure and maintain, at its
          ---------------------
own cost and expense, such insurance coverage as may be required by the Prime
Lessor to be carried by Sublessor, to the extent such coverage pertains to the
Sublease Premises or use
<PAGE>

thereof. The insurance policies obtained and carried pursuant to this provision
shall name Sublessor, as well as Prime Landlord, as additional insureds.
Sublessee shall furnish to Sublessor promptly upon Sublessor's request, but no
later than the Commencement Date, a certificate evidencing Sublessee's insurance
required hereunder.

     19.  ASSIGNMENT OR SUBLETTING. Sublessee shall not have the right to (a)
          ------------------------
assign this Sublease or any interest under it or (b) further sublet the Sublease
Premises unless Sublessee has obtained the written consent of the Prime Lessor
for any such assignment or sublease, which consent may be given or withheld by
Sublessor for any reason whatsoever, in Sublessor's sole discretion. On and
after January 1, 2002, Sublessor shall have the right to locate a new sublessee
and enter a new sublease for the Sublease Premises, provided that if Sublessor
enters into a new sublease, Sublessee shall automatically be released from
libility for any lossess, damages, or expenses which are attributable to the
acts or omissions of such new sublessee. Sublessee shall not be relieved of its
obligation to pay Sublease Rent, Sublease Operating Expenses, Sublease Real
Estate Taxes, or electricity costs in the event the Subleased Premises are
sublet to a new sublessee; however, any payments received by Sublessor from a
new sublessee of the Sublease Premises shall be credited to the amounts owed by
Sublessee to Sublessor under this Sublease. Any merger or consolidation of
Sublessee, wherein Sublessee is not the surviving company, shall be deemed to be
an assignment under this Sublease.

     20.  RULES. Sublessee agrees to comply with all rules and regulations that
          -----
Prime Landlord has made or may hereafter from time to time make for the
Building. Sublessee agrees to indemnify Sublessor and hold Sublessor harmless
from all losses, damages, liabilities and expenses which Sublessor may incur, or
for which Sublessor may be liable to Prime Landlord, arising from Sublessee's
failure to comply with such rules and regulations. Sublessor shall not be liable
in any way for damage caused by the non-observance by any of the other tenants
of such similar covenants in their leases or of such rules and regulations.

     21.  COMPLIANCE. Sublessee shall, at Sublessee's own expense, comply with
          ----------
all laws and ordinances, and all orders, rules and regulations of all
governmental authorities and of all insurance bodies at any time in force,
applicable to Sublessee's Use or manner of use of the Sublease Premises.

     22.  REPAIRS. Sublessee shall be responsible for all repairs to the
          -------
Sublease Premises for which Sublessor would be responsible under the Prime
Lease. To the extent that Sublessee provides notice thereof to Sublessor,
Sublessor shall take all reasonable steps to notify the Prime Landlord of
repairs for which the Prime Landlord is responsible under the Prime Lease.

     23.  FIRE OR CASUALTY OR EMINENT DOMAIN. In the event of a fire or other
          ----------------------------------
casualty affecting the Building or the Sublease Premises, or of a taking of all
or a part of the Building or
<PAGE>

Sublease Premises under the power of eminent domain, Sublessee shall have the
option to terminate this Sublease if Sublessor has the option to terminate the
Prime Lease as a result of such fire, other casualty, or eminent domain. If the
Sublessor would not have the right to terminate the Prime Lease as a result of
such fire, other casualty, or eminent domain, Sublease Rent, Sublease Operating
Expenses, and Sublease Real Estate Taxes shall be abated during the unexpired
term of the Sublease in proportion to the extent of the Sublease Premises which
is taken by eminent domain or not usable by Sublessee during the repair period
set forth in the Prime Lease, and only if Sublessor would be entitled to
abatement under the Prime Lease with respect to such fire, other casualty, or
eminent domain affecting the Building or Sublease Premises.

     24.  ALTERATIONS. Sublessee shall not make alterations and improvements to
          -----------
the Sublease Premises without the prior consent of (a) Sublessor, which shall
not be unreasonably withheld, and (b) Prime Landlord, if Sublessor would be
required under the Prime Lease to obtain the Prime Landlord's consent for such
alterations and improvements. In the event the Prime Landlord's consent is
required for any alterations or improvements to the Sublease Premises, Sublessor
shall take all reasonable steps to assist Sublessee in obtaining such consent.

     25.  SURRENDER. Upon the expiration of this Sublease, or upon the
          ---------
termination of the Sublease or of the Sublessee's right to possession of the
Sublease Premises, Sublessee will at once surrender and deliver up the Sublease
Premises, together with all improvements thereon, to Sublessor in good condition
and repair, reasonable wear and tear excepted.

     26.  HOLDING OVER. Sublessee shall have no right to occupy the Sublease
          ------------
Premises or any portion thereof after the expiration of this Sublease or after
termination of this Sublease or of Sublessee's right to possession in
consequence of an Event of Default hereunder.

     27.  ENCUMBERING TITLE. Sublessee shall not do any act which shall in any
          -----------------
way encumber the title of Prime Landlord in and to the Building or the Sublease
Premises, nor shall the interest or estate of Prime Landlord or Sublessor be in
any way subject to any claim by way of lien or encumbrance, whether by operation
of law by virtue of any express or implied contract by Sublessee, or by reason
of any other act or omission of Sublessee.

     28.  INDEMNITY. Sublessor agrees to indemnify Sublessee and hold Sublessee
          ---------
harmless from all losses, damages, liabilities and expenses which Sublessee may
incur, arising from the negligence of Sublessor or breach by Sublessor of its
obligations or covenants under the Prime Lease or this Sublease. Sublessee
agrees to indemnify Sublessor and hold Sublessor harmless from all losses,
damages, liabilities and expenses which Sublessor may incur, or for which
Sublessor may be liable to Prime Landlord, arising from the acts or omissions of
Sublessee which (a) constitutes negligence of
<PAGE>

Sublessee or a breach by Sublessee of its obligation or covenants under this
Sublease, (b) result in a default by Sublessor under the Prime Lease, or (c)
are the subject matter of any indemnity or hold harmless of Sublessor to Prime
Landlord under the Prime Lease.

     29.  SUBLESSOR'S RESERVED RIGHTS. Sublessor reserves the right, on
          ---------------------------
reasonable prior notice, to inspect the Sublease Premises, or to exhibit the
Sublease Premises to persons having a legitimate interest at any time during the
Term.

     30. DEFAULTS. Sublessee further agrees that any one or more of the
         --------
following events shall be considered Events of Default as said term is used
herein, that is to say, if:

         A. Sublessee shall default in any payment of Sublease Rent, Sublease
     Operating Expenses, or Sublease Real Estate Taxes required to be made by
     Sublessee hereunder when due as herein provided; or

         B. Sublessee shall, by its act or omission to act, cause a default
     under the Prime Lease and such default shall not be cured within the time,
     if any permitted for such cure under the Prime Lease; or

         C. Sublessee shall default in any of the other covenants and
     agreements herein contained to be kept, observed and performed by
     Sublessee, and such default shall continue for ten (10) days after notice
     thereof in writing to Sublessee.

     31.  REMEDIES. Upon the occurrence of any one or more Events of Default,
          --------
Sublessor may exercise any remedy against Sublessee which Prime Landlord may
exercise for default by Sublessor under the Prime Lease.

     32.  NOTICES AND CONSENTS. All notices, demands, requests, consents or
          --------------------
approvals which may or are required to be given by either party to the other
shall be in writing and shall be deemed given when received or refused if sent
by United States registered or certified mail, postage prepaid, return receipt
requested or if sent by overnight commercial courier service (a) if to
Sublessee, addressed to Sublessee at the address specified in Section 1 or at
such other place as Sublessee may from time to time designate by notice in
writing to Sublessor or (b) if for Sublessor, addressed to Sublessor at the
address specified in Section 1 or at such other place as Sublessor may from time
to time designate by notice in writing to Sublessee. Each party agrees promptly
to deliver a copy of each notice, demand, request, consent or approval from such
party to Prime Landlord and promptly to deliver to the other party a copy of any
notice, demand, request, consent or approval received from Prime Landlord. Such
copies shall be delivered by overnight commercial courier.
<PAGE>

     33.  RADON DISCLOSURE. Radon is a naturally occurring radioactive gas that,
          ----------------
when it has accumulated in a building in sufficient quantities, may present
health risks to persons who are exposed to it over time. Levels of radon that
exceed federal and state guidelines have been found in buildings in Florida.
Additional information regarding radon and radon testing may be obtained from
your county public health unit.

     34.  PROVISIONS REGARDING SUBLEASE. This Sublease and all the rights of
          -----------------------------
parties hereunder are subject and subordinate to the Prime Lease. Each party
agrees that it will not, by its act or omission to act, cause a default under
the Prime Lease. In furtherance of the foregoing, the parties hereby confirm,
each to the other, that it is not practical in this Sublease agreement to
enumerate all of the rights and obligations of the various parties under the
Prime Lease and specifically to allocate those rights and obligations in this
Sublease agreement. The parties do not intend that any of the terms of this
Sublease be contrary to the terms of the Prime Lease; in the event that there is
any conflict between the terms of this Sublease and the terms of the Prime
Lease, the Prime Lease shall govern and such terms of the Prime Lease shall be
deemed to be provisions of this Sublease by and between Sublessor and Sublessee.

     35.  PRIME LANDLORD'S CONSENT. This Sublease and the obligations of the
          ------------------------
parties hereunder are expressly conditioned upon Sublessor's obtaining prior
written consent hereto by Prime Landlord, if such written consent is required
under the Prime Lease.
<PAGE>

Signed, sealed and delivered
in the presence of:                    HEALTHPLAN SERVICES, INC.,
                                       A Florida corporation

/s/ C. Deryl Couch                     By: /s/ M. Steven Liff
------------------------------            -------------------------------
Name: C. Deryl Couch                      Name: M. Steven Liff
     -------------------------                 --------------------------
/s/ Olga M. Pina                          Title:
------------------------------                  -------------------------
Name: Olga M. Pina
     -------------------------
                                             "SUBLESSOR"

                                       PLANVISTA CORPORATION,
                                       a Delaware corporation

/s/ C. Deryl Couch                     By: /s/ Phillip S. Dingle
------------------------------            -------------------------------
Name: C. Deryl Couch                      Name: Phillip S. Dingle
     -------------------------                 --------------------------
/s/ Olga M. Pina                          Title: Chief Executive Officer
------------------------------                  -------------------------
Name: Olga M. Pina
     -------------------------

                                       9

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