content: <PAGE>
                                                               OMB APPROVAL
                                                        --------------------------
                                                        OMB Number:      3235-0101
                                                        Expires: November 30, 2003
                                                        Estimated average burden
                      UNITED STATES                     hours per response.....2.0
           SECURITIES AND EXCHANGE COMMISSION
                  WASHINGTON, DC 20549                         SEC USE ONLY
                        FORM 144                        --------------------------
     NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT     DOCUMENT SEQUENCE NO.
      TO RULE 144 UNDER THE SECURITIES ACT OF 1933
                                                        --------------------------
                                                        CUSIP NUMBER
  ATTENTION: Transmit for filing 3 copies of this
             form concurrently with either placing      --------------------------
             an order with a broker to execute          WORK LOCATION
             sale or executing a sale directly
             with a market maker.                       --------------------------
  <Table>
  <S><C>
  ---------------------------------------------------------------------------------------------------------
   1(a) NAME OF ISSUER (PLEASE TYPE OR PRINT)                  (b) I.R.S. IDENT. NO.    (c) S.E.C. FILE NO.
        Advanced Neuromodulation Systems, Inc.                     75-1646002               0-10521
  ------------------------------------------------------------------------------------------------------------------------------------
   1(d) ADDRESS OF ISSUER                   STREET           CITY           STATE           ZIP CODE             (e) TELEPHONE NO.
                                                                                                              ------------------------
                                                                                                              AREA CODE      NUMBER
        6501 Windcrest Drive                                 Plano          Texas           75024                972        309-8000
  ------------------------------------------------------------------------------------------------------------------------------------
   2(a) NAME OF PERSON FOR WHOSE ACCOUNT   (b) I.R.S. IDENT.  (c) RELATIONSHIP      (d) ADDRESS    STREET    CITY    STATE    ZIP CODE
        THE SECURITIES ARE TO BE SOLD          NO.                TO ISSUER
  
        Christopher G. Chavez                  ###-##-####        President and CEO     2900 Cedar Ridge Road, McKinney, Texas 75070
  ------------------------------------------------------------------------------------------------------------------------------------
  </Table>
  
   INSTRUCTION: The person filing this notice should contact the issuer to obtain
                      the I.R.S. Identification Number and the S.E.C. File Number.
  <Table>
  <Caption>
  ------------------------------------------------------------------------------------------------------------------------------
         3(a)                            (b)                                                    (c)                  (d)
     TITLE OF THE          NAME AND ADDRESS OF EACH BROKER           S.E.C. USE ONLY     NUMBER OF SHARES         AGGREGATE
       CLASS OF         THROUGH WHOM THE SECURITIES ARE TO BE        ---------------      OR OTHER UNITS           MARKET
      SECURITIES         OFFERED OR EACH MARKET MAKER WHO IS          BROKER-DEALER         TO BE SOLD              VALUE
      TO BE SOLD               ACQUIRING THE SECURITIES                FILE NUMBER       (See Instr. 3(c))    (See Instr. 3(d))
  <S>                   <C>                                          <C>                 <C>                  <C>
  ------------------------------------------------------------------------------------------------------------------------------
  Common Stock,                 Ryan Beck and Company                                        72,500(1)          $3,063,125.00
   $0.05 Par Value              2125 Center Ave.
                                Fort Lee, NJ 07024
  ------------------------------------------------------------------------------------------------------------------------------
  <Caption>
  
       (e)                      (f)                    (g)
  NUMBER OF SHARES            APPROXIMATE            NAME OF EACH
   OR OTHER UNITS             DATE OF SALE            SECURITIES
     OUTSTANDING           (See instr. 3(f))           EXCHANGE
  (See Instr. 3(e))         (MO., DAY, YR.)       (See Instr. 3(g))
  <S>                   <C>                      <C>
  ------------------------------------------------------------------------------------------------
     19,568,312            November 28, 2003            NASDAQ
  ------------------------------------------------------------------------------------------------
  </Table>
  
  INSTRUCTIONS:
     1.  (a) Name of issuer.
         (b) Issuer's I.R.S. Identification Number
         (c) Issuer's S.E.C. file number, if any
         (d) Issuer's address, including zip code
         (e) Issuer's telephone number, including area code
     2.  (a) Name of person for whose account the securities are
             to be sold
         (b) Such person's I.R.S. identification number, if such
             person is an entity
         (c) Such person's relationship to the issuer (e.g.,
             officer, director, 10 percent stockholder, or member
             of immediate family of any of the foregoing)
         (d) Such person's address, including zip code
     3.  (a) Title of the class of securities to be sold
         (b) Name and address of each broker through whom the
             securities are intended to be sold
         (c) Number of shares or other units to be sold (if debt
             securities, give the aggregate face amount)
         (d) Aggregate market value of the securities to be sold
             as of a specified date within 10 days prior to the
             filing of this notice
         (e) Number of shares or other units of the class
             outstanding, or if debt securities the face amount
             thereof outstanding, as shown by the most recent
             report or statement published by the issuer
         (f) Approximate date on which the securities are to be sold
         (g) Name of each securities exchange, if any, on which
             the securities are intended to be sold
  
  POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED
  IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY
  VALID OMB CONTROL NUMBER.
                                                                              OVER
                                                                   SEC 1147 (9-03)
  <PAGE>
                           TABLE I--SECURITIES TO BE SOLD
      Furnish the following information with respect to the acquisition of the
    securities to be sold and with respect to the payment of all or any part of
                the purchase price or other consideration therefor:
  
  <Table>
  <Caption>
  ---------------------------------------------------------------------------------------------------------------------------------
       Title of    Date You    Nature of Acquisition    Name of Person from        Amount of         Date of      Nature of Payment
      the Class    Acquired       Transaction            Whom Acquired             Securities        Payment
                                                        (If gift, also give        Acquired
                                                        date donor acquired)
  <S>             <C>         <C>                      <C>                        <C>                <C>         <C>
  ---------------------------------------------------------------------------------------------------------------------------------
  Common Stock      04/09/98    Stock Option Grant            ANSI                   35,000          11/28/03           Cash
  $0.05 Par Value
  Common Stock      03/31/99    Stock Option Grant            ANSI                   37,500          11/28/03           Cash
  $0.05 Par Value
  ---------------------------------------------------------------------------------------------------------------------------------
  </Table>
  
  INSTRUCTIONS:
      If the securities were purchased and full payment therefore was not made in
      cash at the time of purchase, explain in the table or in note thereto the
      nature of the consideration given. If the consideration consisted of any
      note or other obligation, or if payment was made in installments describe
      the arrangement and state when the note or other obligation was discharged
      in full or the last installment paid.
  
      If within two years after the acquisition of the securities the person for
      whose account they are to be sold had any short positions, put or other
      option to dispose of securities referred to in paragraph (d)(3) of Rule 144,
      furnish full information with respect thereto.
  --------------------------------------------------------------------------------
  
                 TABLE II--SECURITIES SOLD DURING THE PAST 3 MONTHS
     Furnish the following information as to all securities of the issuer sold
      during the past 3 months by the person for whose account the securities
                                  are to be sold.
  
  <Table>
  <Caption>
  ------------------------------------------------------------------------------------------------------------------------------------
     Name and Address of Seller             Title of Securities Sold         Date of Sale         Amount of        Gross Proceeds
                                                                                                 Securities
                                                                                                    Sold
  <S>                                      <C>                              <C>                  <C>               <C>
  ------------------------------------------------------------------------------------------------------------------------------------
  
  ------------------------------------------------------------------------------------------------------------------------------------
  </Table>
  
  REMARKS:
   (1) On August 29, 2003, Christopher G. Chavez, President and Chief Executive
   Officer of Advanced Neuromodulation Systems, Inc. (ANS), entered into a "Preset
   Diversification Program" (PDP), a stock disposition plan intended to qualify
   for the safe harbor offered by Rule 10b5-1 under the Securities Exchange Act of
   1934, as amended, with an effective date of November 28, 2003. Under Mr.
   Chavez's PDP, he authorized his broker to sell up to 102,500 shares of ANS
   common stock (30,000 shares owned outright by Mr. Chavez and 72,500 shares
   which Mr. Chavez will obtain by exercising certain stock options). The shares
   covered by this Form 144 are being sold pursuant to this PDP. Mr. Chavez has
   informed the Company that the purpose of his PDP is to assist him in the
   diversification of his portfolio. Mr. Chavez represented to the Company that he
   had no knowledge of any material nonpublic information regarding the Company
   when he adopted his written PDP plan.
  
  INSTRUCTIONS:
   See the definition of "person" in paragraph (a) of Rule 144. Information is to
   be given not only as to the person for whose account the securities are to be
   sold but also as to all other persons included in that definition. In addition,
   information shall be given as to sales by all persons whose sales are required
   by paragraph (e) of Rule 144 to be aggregated with sales for the account of the
   person filing this notice.
                                 November 28, 2003
                      ----------------------------------------
                                  (DATE OF NOTICE)
  ATTENTION:
   The person for whose account the securities to which this notice relates are to
   be sold hereby represents by signing this notice that he does not know any
   material adverse information in regard to the current and prospective
   operations of the Issuer of the securities to be sold which has not been
   publicly disclosed.
  
         Christopher G. Chavez
  
                      BY: /s/Linda Moses, by Power of Attorney
                      ----------------------------------------
                                    (SIGNATURE)
  
   The notice shall be signed by the person for whose account the securities are
  to be sold. At least one copy of the notice shall be manually signed. Any copies
            not manually signed shall bear typed or printed signatures.
  
   ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSION OF FACTS CONSTITUTE FEDERAL
                     CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)
  
                                                                   SEC 1147 (9-03)
metadata_documents: [{"type": "144", "sequence": "1", "filename": "d10938be144.txt", "description": "FORM 144", "secsgml_size_bytes": 12898}]
text: OMB APPROVAL
                                                        --------------------------
                                                        OMB Number:      3235-0101
                                                        Expires: November 30, 2003
                                                        Estimated average burden
                      UNITED STATES                     hours per response.....2.0
           SECURITIES AND EXCHANGE COMMISSION
                  WASHINGTON, DC 20549                         SEC USE ONLY
                        FORM 144                        --------------------------
     NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT     DOCUMENT SEQUENCE NO.
      TO RULE 144 UNDER THE SECURITIES ACT OF 1933
                                                        --------------------------
                                                        CUSIP NUMBER
  ATTENTION: Transmit for filing 3 copies of this
             form concurrently with either placing      --------------------------
             an order with a broker to execute          WORK LOCATION
             sale or executing a sale directly
             with a market maker.                       --------------------------
  ---------------------------------------------------------------------------------------------------------
   1(a) NAME OF ISSUER (PLEASE TYPE OR PRINT)                  (b) I.R.S. IDENT. NO.    (c) S.E.C. FILE NO.
        Advanced Neuromodulation Systems, Inc.                     75-1646002               0-10521
  ------------------------------------------------------------------------------------------------------------------------------------
   1(d) ADDRESS OF ISSUER                   STREET           CITY           STATE           ZIP CODE             (e) TELEPHONE NO.
                                                                                                              ------------------------
                                                                                                              AREA CODE      NUMBER
        6501 Windcrest Drive                                 Plano          Texas           75024                972        309-8000
  ------------------------------------------------------------------------------------------------------------------------------------
   2(a) NAME OF PERSON FOR WHOSE ACCOUNT   (b) I.R.S. IDENT.  (c) RELATIONSHIP      (d) ADDRESS    STREET    CITY    STATE    ZIP CODE
        THE SECURITIES ARE TO BE SOLD          NO.                TO ISSUER
  
        Christopher G. Chavez                  ###-##-####        President and CEO     2900 Cedar Ridge Road, McKinney, Texas 75070
  ------------------------------------------------------------------------------------------------------------------------------------
  INSTRUCTION: The person filing this notice should contact the issuer to obtain
                      the I.R.S. Identification Number and the S.E.C. File Number.
  ------------------------------------------------------------------------------------------------------------------------------
         3(a)                            (b)                                                    (c)                  (d)
     TITLE OF THE          NAME AND ADDRESS OF EACH BROKER           S.E.C. USE ONLY     NUMBER OF SHARES         AGGREGATE
       CLASS OF         THROUGH WHOM THE SECURITIES ARE TO BE        ---------------      OR OTHER UNITS           MARKET
      SECURITIES         OFFERED OR EACH MARKET MAKER WHO IS          BROKER-DEALER         TO BE SOLD              VALUE
      TO BE SOLD               ACQUIRING THE SECURITIES                FILE NUMBER       (See Instr. 3(c))    (See Instr. 3(d))
  ------------------------------------------------------------------------------------------------------------------------------
  Common Stock,                 Ryan Beck and Company                                        72,500(1)          $3,063,125.00
   $0.05 Par Value              2125 Center Ave.
                                Fort Lee, NJ 07024
  ------------------------------------------------------------------------------------------------------------------------------
  (e)                      (f)                    (g)
  NUMBER OF SHARES            APPROXIMATE            NAME OF EACH
   OR OTHER UNITS             DATE OF SALE            SECURITIES
     OUTSTANDING           (See instr. 3(f))           EXCHANGE
  (See Instr. 3(e))         (MO., DAY, YR.)       (See Instr. 3(g))
  ------------------------------------------------------------------------------------------------
     19,568,312            November 28, 2003            NASDAQ
  ------------------------------------------------------------------------------------------------
  INSTRUCTIONS:
     1.  (a) Name of issuer.
         (b) Issuer's I.R.S. Identification Number
         (c) Issuer's S.E.C. file number, if any
         (d) Issuer's address, including zip code
         (e) Issuer's telephone number, including area code
     2.  (a) Name of person for whose account the securities are
             to be sold
         (b) Such person's I.R.S. identification number, if such
             person is an entity
         (c) Such person's relationship to the issuer (e.g.,
             officer, director, 10 percent stockholder, or member
             of immediate family of any of the foregoing)
         (d) Such person's address, including zip code
     3.  (a) Title of the class of securities to be sold
         (b) Name and address of each broker through whom the
             securities are intended to be sold
         (c) Number of shares or other units to be sold (if debt
             securities, give the aggregate face amount)
         (d) Aggregate market value of the securities to be sold
             as of a specified date within 10 days prior to the
             filing of this notice
         (e) Number of shares or other units of the class
             outstanding, or if debt securities the face amount
             thereof outstanding, as shown by the most recent
             report or statement published by the issuer
         (f) Approximate date on which the securities are to be sold
         (g) Name of each securities exchange, if any, on which
             the securities are intended to be sold
  
  POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED
  IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY
  VALID OMB CONTROL NUMBER.
                                                                              OVER
                                                                   SEC 1147 (9-03)
  TABLE I--SECURITIES TO BE SOLD
      Furnish the following information with respect to the acquisition of the
    securities to be sold and with respect to the payment of all or any part of
                the purchase price or other consideration therefor:
  ---------------------------------------------------------------------------------------------------------------------------------
       Title of    Date You    Nature of Acquisition    Name of Person from        Amount of         Date of      Nature of Payment
      the Class    Acquired       Transaction            Whom Acquired             Securities        Payment
                                                        (If gift, also give        Acquired
                                                        date donor acquired)
  ---------------------------------------------------------------------------------------------------------------------------------
  Common Stock      04/09/98    Stock Option Grant            ANSI                   35,000          11/28/03           Cash
  $0.05 Par Value
  Common Stock      03/31/99    Stock Option Grant            ANSI                   37,500          11/28/03           Cash
  $0.05 Par Value
  ---------------------------------------------------------------------------------------------------------------------------------
  INSTRUCTIONS:
      If the securities were purchased and full payment therefore was not made in
      cash at the time of purchase, explain in the table or in note thereto the
      nature of the consideration given. If the consideration consisted of any
      note or other obligation, or if payment was made in installments describe
      the arrangement and state when the note or other obligation was discharged
      in full or the last installment paid.
  
      If within two years after the acquisition of the securities the person for
      whose account they are to be sold had any short positions, put or other
      option to dispose of securities referred to in paragraph (d)(3) of Rule 144,
      furnish full information with respect thereto.
  --------------------------------------------------------------------------------
  
                 TABLE II--SECURITIES SOLD DURING THE PAST 3 MONTHS
     Furnish the following information as to all securities of the issuer sold
      during the past 3 months by the person for whose account the securities
                                  are to be sold.
  ------------------------------------------------------------------------------------------------------------------------------------
     Name and Address of Seller             Title of Securities Sold         Date of Sale         Amount of        Gross Proceeds
                                                                                                 Securities
                                                                                                    Sold
  ------------------------------------------------------------------------------------------------------------------------------------
  
  ------------------------------------------------------------------------------------------------------------------------------------
  REMARKS:
   (1) On August 29, 2003, Christopher G. Chavez, President and Chief Executive
   Officer of Advanced Neuromodulation Systems, Inc. (ANS), entered into a "Preset
   Diversification Program" (PDP), a stock disposition plan intended to qualify
   for the safe harbor offered by Rule 10b5-1 under the Securities Exchange Act of
   1934, as amended, with an effective date of November 28, 2003. Under Mr.
   Chavez's PDP, he authorized his broker to sell up to 102,500 shares of ANS
   common stock (30,000 shares owned outright by Mr. Chavez and 72,500 shares
   which Mr. Chavez will obtain by exercising certain stock options). The shares
   covered by this Form 144 are being sold pursuant to this PDP. Mr. Chavez has
   informed the Company that the purpose of his PDP is to assist him in the
   diversification of his portfolio. Mr. Chavez represented to the Company that he
   had no knowledge of any material nonpublic information regarding the Company
   when he adopted his written PDP plan.
  
  INSTRUCTIONS:
   See the definition of "person" in paragraph (a) of Rule 144. Information is to
   be given not only as to the person for whose account the securities are to be
   sold but also as to all other persons included in that definition. In addition,
   information shall be given as to sales by all persons whose sales are required
   by paragraph (e) of Rule 144 to be aggregated with sales for the account of the
   person filing this notice.
                                 November 28, 2003
                      ----------------------------------------
                                  (DATE OF NOTICE)
  ATTENTION:
   The person for whose account the securities to which this notice relates are to
   be sold hereby represents by signing this notice that he does not know any
   material adverse information in regard to the current and prospective
   operations of the Issuer of the securities to be sold which has not been
   publicly disclosed.
  
         Christopher G. Chavez
  
                      BY: /s/Linda Moses, by Power of Attorney
                      ----------------------------------------
                                    (SIGNATURE)
  
   The notice shall be signed by the person for whose account the securities are
  to be sold. At least one copy of the notice shall be manually signed. Any copies
            not manually signed shall bear typed or printed signatures.
  
   ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSION OF FACTS CONSTITUTE FEDERAL
                     CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)
  
                                                                   SEC 1147 (9-03)