<TABLE> <S> <C>


<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 CORPORATION
<MULTIPLIER>                  1,000
<CURRENCY>                    U.S. DOLLARS

<S>                           <C>                <C>               <C>
<PERIOD-TYPE>                 3-MOS              6-MOS             9-MOS
<FISCAL-YEAR-END>             DEC-31-1998        DEC-31-1998       DEC-31-1998
<PERIOD-START>                JAN-01-1998        JAN-01-1998       JAN-01-1998
<PERIOD-END>                  MAR-31-1998        JUN-30-1998       SEP-30-1998
<EXCHANGE-RATE>                         1                  1                 1
<CASH>                             11,352             13,576            18,531
<SECURITIES>                      104,721            105,469           109,954
<RECEIVABLES>                      72,376             82,231            86,434
<ALLOWANCES>                       (1,298)            (1,842)           (1,978)
<INVENTORY>                             0                  0                 0
<CURRENT-ASSETS>                  200,294            210,251           225,696
<PP&E>                             57,998             65,530            72,298
<DEPRECIATION>                     28,026             31,371            37,294
<TOTAL-ASSETS>                    242,586            259,943           274,777
<CURRENT-LIABILITIES>              46,861             56,202            60,590
<BONDS>                                 0                  0                 0
<PREFERRED-MANDATORY>                   0                  0                 0
<PREFERRED>                             0                  0                 0
<COMMON>                              263                273               265
<OTHER-SE>                        186,803            192,619           213,922
<TOTAL-LIABILITY-AND-EQUITY>      242,586            259,943           274,777
<SALES>                            78,809            164,971           255,908
<TOTAL-REVENUES>                   78,809            164,971           255,908
<CGS>                              44,367             92,461           142,823
<TOTAL-COSTS>                      28,675             56,802            86,774
<OTHER-EXPENSES>                     (971)            (1,996)           (3,242)
<LOSS-PROVISION>                      162                301               432
<INTEREST-EXPENSE>                    203                443               822
<INCOME-PRETAX>                     6,738             17,704            29,553
<INCOME-TAX>                        4,940             10,340            15,990
<INCOME-CONTINUING>                 1,798              7,364            13,563
<DISCONTINUED>                          0                  0                 0
<EXTRAORDINARY>                         0                  0                 0
<CHANGES>                               0                  0                 0
<NET-INCOME>                        1,798              7,364            13,563
<EPS-BASIC>                          0.07               0.27              0.50
<EPS-DILUTED>                        0.06               0.26              0.48




</TABLE>