WASHINGTON, D.C. 20549

                                 SCHEDULE 13G/A


                                AMENDMENT NO. 18*

                               CERNER CORPORATION
                                (Name of Issuer)

                                  COMMON STOCK
                         (Title of Class of Securities)

                                 (CUSIP Number)

                                DECEMBER 31, 2003
             (Date of Event Which Requires Filing of this Statement)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities and Exchange Act
of 1934 ("Act") or otherwise subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act (however, see the

                                 SCHEDULE 13G/A
                          FILED PURSUANT TO RULE 13d-7

Item 1(a):    Name of Issuer:

                   Cerner Corporation

Item 1(b):    Name of Issuer's Principal Executive Offices:

                   2800 Rockcreek Parkway, 601
                   Kansas City, MO  64117

Item 2(a):    Name of Person Filing:

                   Clifford W. Illig

Item 2(b):    Address or Principal Business Office or, if None, Residence:

                   (i) -(ii) 2800 Rockcreek Parkway, Suite 601
                             Kansas City, MO  64117

Item 2(c):    Citizenship:

                   United States

Item 2(d):    Title of Class of Securities:

                   Common Stock

Item 2(e):    CUSIP Number:


Item 3:       If this statement is filed pursuant to Rules 13d-1(b), or
              13d-2(b), check whether the person filing is a:

                   Not Applicable.

Item 4:       Ownership

                   (a) Amount Beneficially Owned:  2,812,381*

                   (b) Percent of Class:     7.89%

                   (c) Number of Shares as to which such person has:

                       (i)   sole power to vote or to direct the vote:

                       (ii)  shared power to vote or to direct the vote:
                       (iii) sole power to dispose or to direct the disposition
                             of:                                     2,750,371 *

                       (iv)  shared power to dispose or to direct the
                             disposition of:                              62,010

                             * Such number of shares includes 195,667 shares
                               held by Bonne Illig, wife of Clifford W. Illig,
                               as trustee for their minor children.

Item 5:       Ownership of Five Percent or Less of a Class.

                   If this statement is being filed to report the fact that as
                   of the date hereof, the reporting person has ceased to be the
                   beneficial owner of more than five percent of the class of
                   securities, check the following ( ).

Item 6:       Ownership of More than Five Percent on Behalf of Another Person

                   Shares (constituting a portion of the number of shares
                   reported under Item 4) are held on behalf of Clifford W.
                   Illig by a trustee under the Cerner Corporation Employee
                   Stock Purchase Retirement Plan, the trustee receives the
                   dividends pursuant to the terms of the plan.

Item 7:       Identification and Classification of the Subsidiary Which Acquired
              the Security Being Reported on By the Parent Holding Company.

                   Not Applicable.

Item 8:       Identification and Classification of Members of the Group.

                   Not Applicable.

Item 9:       Notice of Dissolution of Group.

                   Not Applicable.

Item 10:      Certification

                   Not Applicable.


              After reasonable inquiry and to the best of my knowledge and
              belief, I certify that the information set forth in this statement
              is true, complete and correct.

By: /s/Clifford W. Illig
    Clifford W. Illig
    Vice Chairman

February 17, 2004