Document:

<PAGE>
                                                                   EXHIBIT 10.23

                                    ANNEX K

                     Third Amendment to the Agreement and
                   Plan of Merger by and Among Halis, Inc.,
              HealthWatch Merger Sub, Inc. and HealthWatch, Inc.
                         dated as of January 16, 2001

<PAGE>

                            THIRD AMENDMENT TO THE
                            ----------------------
  AGREEMENT AND PLAN OF MERGER BY AND AMONG, HALIS, INC., HEALTHWATCH MERGER
  --------------------------------------------------------------------------
                        SUB, INC. AND HEALTHWATCH, INC.
                        -------------------------------

     This THIRD AMENDMENT TO THE AGREEMENT AND PLAN OF MERGER BY AND AMONG,
HALIS, INC., HEALTHWATCH MERGER SUB, INC. AND HEALTHWATCH, INC. ("Amendment"),
dated as of February 16, 2001 is made and entered into by and among (i) Halis,
Inc. ("Halis"), a Georgia corporation, (ii) HealthWatch Merger Sub, Inc.("Merger
Sub"), a Georgia Corporation  and (iii) HealthWatch, Inc. ("HealthWatch"), a
Minnesota corporation.

     WHEREAS, Halis, Merger Sub and HealthWatch have entered into that certain
Agreement and Plan of Merger dated as of June 29, 2000, as amended by the
parties on September 29, 2000 and January 31, 2001 (the "Agreement"), in which
HealthWatch will acquire Halis upon the merger of Halis with and into Merger
Sub, a wholly-owned subsidiary of HealthWatch, upon the terms and conditions
included in the Agreement; and

     WHEREAS, the parties desire to extend the lock-up period provided in
Section 5.13  of the Agreement to allow the parties the benefits of the lock-up
provision as contemplated by the parties when the Agreement was first executed
on June 29, 2000.

     THEREFORE, for good and valuable consideration, the receipt and sufficiency
of which hereby are acknowledged, the parties, intending to be legally bound, do
hereby agree as follows:

     1.   Section 5.13 of the Agreement shall be deleted in its entirety and
replaced with the following:

     "SECTION 5.13 LOCK-UP.   Substantial Halis Stockholders (defined as
     directors, officers and Halis Shareholders owning 5% or more of Halis
     Common Stock) and Affiliates will be required to agree not to sell,
     transfer or otherwise dispose of any HealthWatch Common Stock prior to
     December 31, 2001 (the "Lockup Period"); if HealthWatch undertakes a public
     offering within the Lockup Period, Halis Stockholders shall agree not to
     sell, transfer or otherwise dispose of the HealthWatch Common Stock for
     such period of time after completion of such public offering (not to exceed
     one year).  In addition, Halis shall use its best efforts to obtain similar
     lock-up agreements from other Halis Shareholders that the parties shall
     reasonably determine to be in the best interest of all of the parties in
     carrying out the transactions contemplated by this Agreement.

     2.   Except as modified by this Amendment, all terms and conditions of the
Agreement are hereby reaffirmed.
<PAGE>

     IN WITNESS WHEREOF, the undersigned have executed this Amendment as of the
effective date mentioned above.

                                         HALIS, INC.

                                           By:  /s/ Joel Greenspan
                                                ------------------------------
                                           Its: Director
                                                ------------------------------
                                           Attest: /s/ Marilyn May
                                                   ---------------------------
                                           Its: Asst. Secretary
                                                ------------------------------

                                                      [CORPORATE SEAL]

                                           HEALTHWATCH, INC.

                                           HEALTHWATCH MERGER SUB, INC.

                                           By:  /s/ Thomas C. Riderour
                                                -----------------------------
                                           Its: Chief Financial Officer
                                                -----------------------------

                                           Attest: /s/ Marilyn May
                                                   --------------------------
                                           Its: Asst. Secretary
                                                -----------------------------

                                                      [CORPORATE SEAL]

                                           By:  /s/ Paul W. Harrison
                                                ------------------------------
                                           Its: President
                                                ------------------------------

                                           Attest: /s/ Marilyn May
                                                   ---------------------------
                                           Its: Asst. Secretary
                                                ------------------------------

                                                      [CORPORATE SEAL]

                                       2<PAGE>

                                                                   EXHIBIT 10.24

                            Fourth Amendment to the
            Agreement and Plan of Merger by and Among, Halis, Inc.,
              Healthwatch Merger Sub. Inc. and Healthwatch, Inc.

<PAGE>

                            FOURTH AMENDMENT TO THE
                            -----------------------
           AGREEMENT AND PLAN OF MERGER BY AND AMONG, HALIS, INC.,
           --------------------------------------------------------
              HEALTHWATCH MERGER SUB, INC. AND HEALTHWATCH, INC.
              -------------------------------------------------

       This FOURTH AMENDMENT TO THE AGREEMENT AND PLAN OF MERGER BY AND AMONG,
HALIS, INC., HEALTHWATCH MERGER SUB, INC. AND HEALTHWATCH, INC. ("Amendment"),
dated as of March 28, 2001 is made and entered into by and among (i) Halis, Inc.
("Halis"), a Georgia corporation, (ii) HealthWatch Merger Sub, Inc.("Merger
Sub"), a Georgia Corporation  and (iii) HealthWatch, Inc. ("HealthWatch"), a
Minnesota corporation.

     WHEREAS, Halis, Merger Sub and HealthWatch have entered into that certain
Agreement and Plan of Merger dated as of June 29, 2000, as amended by the
parties on September 29, 2000, January 31, 2001 and February 16, 2001 (the
"Agreement") in which HealthWatch will acquire Halis upon the merger of Halis
with and into Merger Sub, a wholly-owned subsidiary of HealthWatch, upon the
terms and conditions included in the Agreement; and

     WHEREAS, the parties desire to extend the date provided in Section 7.1(b)
and Section 5.1(d)  of the Agreement to allow the additional time required to
satisfy the conditions to closing the merger.

     THEREFORE, for good and valuable consideration, the receipt and sufficiency
of which hereby are acknowledged, the parties, intending to be legally bound, do
hereby agree as follows:

     1.   Section 7.1(b) of the Agreement shall  be deleted in its entirety and
replaced with the following:

     "(b) by either the Board of Directors of Halis or the Board of Directors of
     HealthWatch: (i) if the Merger shall not have been consummated by April 30,
     2001, unless such termination right has been expressly restricted in
     writing by the Board of Directors of Halis or HealthWatch, as the case may
     be; provided, however, that the right to terminate this Agreement pursuant
     to this Section 7.1(b)(i) shall not be available to any party whose failure
     to perform any of its obligations under this Agreement results in the
     failure of the Merger to be consummated by such time; (ii) if the
     HealthWatch Stockholder Approval shall not have been obtained at a
     HealthWatch Stockholders' Meeting duly convened therefor or at any
     adjournment or postponement thereof; (iii) if the Halis Stockholder
     Approval shall not have been obtained at a Halis Stockholders' Meeting duly
     convened therefor or at any adjournment or postponement thereof; (iv) if
     any Restraint having any of the effects set forth in Section 6.1(d) shall
     be in effect and shall have become final and nonappealable, or if any
     Governmental Entity that must grant a Requisite Regulatory Approval has
     denied approval of the Merger and such denial has become final and
     nonappealable; provided, that the party

<PAGE>

     seeking to terminate this Agreement pursuant to this Section 7.1(b)(iv)
     shall have used commercially reasonable efforts to prevent the entry of and
     to remove such Restraint or to obtain such Requisite Regulatory Approval,
     as the case may be; or (v) if the financial advisor opinion required by
     Section 6.1(g) or (h) is not received because the advisor indicates that it
     does not deem the transaction fair as stated in such Sections."

     2.   Section 5.1(d) of the Agreement shall  be deleted in its entirety and
replaced with the following:

     "(d) Halis and HealthWatch will use commercially reasonable efforts to hold
the HealthWatch Stockholders' Meeting and the Halis Stockholders' Meeting on the
same date and as soon as reasonably practicable after the date hereof, but not
later than April 30, 2001."

     3.   Except as modified by this Amendment, all terms and conditions of the
Agreement are hereby reaffirmed.

             [the remainder of this page intentionally left blank]

                                       2

<PAGE>

     IN WITNESS WHEREOF, the undersigned have executed this Amendment as of the
effective date mentioned above.

                                        HALIS, INC.

                                        By: /s/ Joel Greenspan
                                        Its: Director

                                        Attest: /s/ Marilyn May
                                        Its: Vice President

                                              [CORPORATE SEAL]

                                        HEALTHWATCH, INC.
                                        By: /s/ Thomas C. Ridenour
                                        Its: Chief Financial Officer

                                        Attest: /s/ Marilyn May
                                        Its: Vice President

                                              [CORPORATE SEAL]

                                        HEALTHWATCH MERGER SUB, INC.
                                        By: Paul W. Harrison
                                        Its: Chief Executive Officer

                                        Attest: /s/ Marilyn May
                                        Its: Vice President

                                              [CORPORATE SEAL]

                                       3

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00024-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00024-of-00352.parquet"}]]