<ARTICLE>                     5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM COMPANY'S
CONDENSED CONSOLIDATED BALANCE SHEET AND STATEMENT OF INCOME TAXES AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK>                         0001001185
<NAME>                        IDX SYSTEMS COPORATION
<MULTIPLIER>                  1,000
<CURRENCY>                    U.S. DOLLARS

                                            
<PERIOD-TYPE>                 9-MOS               9-MOS
<FISCAL-YEAR-END>             DEC-31-1999         DEC-31-1998
<PERIOD-START>                JAN-01-1999         JAN-01-1998
<PERIOD-END>                  SEP-30-1999         SEP-30-1998
<EXCHANGE-RATE>                         1                   1
<CASH>                             29,064              18,531
<SECURITIES>                       44,832             109,954
<RECEIVABLES>                     114,574              86,434
<ALLOWANCES>                       (3,200)             (1,978)
<INVENTORY>                             0                   0
<CURRENT-ASSETS>                  201,354             225,696
<PP&E>                            101,713              72,298
<DEPRECIATION>                     47,168              37,294
<TOTAL-ASSETS>                    275,614             274,777
<CURRENT-LIABILITIES>              62,123              60,590
<BONDS>                                 0                   0
<PREFERRED-MANDATORY>                   0                   0
<PREFERRED>                             0                   0
<COMMON>                              358                 265
<OTHER-SE>                        204,033             213,922
<TOTAL-LIABILITY-AND-EQUITY>      275,614             274,777
<SALES>                           253,123             255,908
<TOTAL-REVENUES>                  253,123             255,908
<CGS>                             161,540             142,823
<TOTAL-COSTS>                     106,781              86,774
<OTHER-EXPENSES>                    1,642                   0
<LOSS-PROVISION>                    1,256                 432
<INTEREST-EXPENSE>                    862                 822
<INCOME-PRETAX>                   (15,044)             29,553
<INCOME-TAX>                       (5,394)             15,990
<INCOME-CONTINUING>                (9,650)             13,563
<DISCONTINUED>                          0                   0
<EXTRAORDINARY>                         0                   0
<CHANGES>                               0                   0
<NET-INCOME>                       (9,650)             13,563
<EPS-BASIC>                       (0.35)               0.50
<EPS-DILUTED>                       (0.35)               0.48