EXHIBIT 21 HMS HOLDINGS CORP. LIST OF SUBSIDIARIES STATE OF SUBSIDIARY INCORPORATION - ---------- ------------- Accordis Inc. ......................................... New York 401 Park Avenue South New York, NY 10016 Health Management Systems, Inc. ....................... New York 401 Park Avenue South New York, NY 10016 Health Receivables Management, Inc..................... Delaware 820 West Jackson Boulevard, Suite 725 Chicago, IL 60607 HMS Business Services Inc. ............................ New York 401 Park Avenue South New York, NY 10016