NPPES file of Aug 9, 2026

Find an organization's NPI

52 active organization NPIs are registered under names beginning "Keystone Service Systems". Each location can bill under its own NPI, so add the city to find the one you need.

26 to 50 of 52, exact name first

  1. Keystone Service Systems INC

    Community/Behavioral Health Agency · Harrisburg, PA · issued Mar 26, 2024

    1700636339
  2. Keystone Service Systems INC

    Community/Behavioral Health Agency · Harrisburg, PA · issued Mar 26, 2024

    1083464606
  3. Keystone Service Systems, INC

    Case Management Agency · Hummelstown, PA · issued Apr 3, 2007

    1760503247
  4. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Hummelstown, PA · issued Apr 6, 2009

    1942442074
  5. Keystone Service Systems

    Community/Behavioral Health Agency · Hummelstown, PA · issued Apr 6, 2009

    1972745008
  6. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Lancaster, PA · issued Aug 18, 2008

    1154577427
  7. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Lancaster, PA · issued Aug 18, 2008

    1073769360
  8. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Lancaster, PA · issued Aug 18, 2008

    1235385519
  9. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Lancaster, PA · issued Aug 19, 2008

    1245487529
  10. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Lancaster, PA · issued Aug 20, 2008

    1386891406
  11. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Lancaster, PA · issued Aug 21, 2008

    1205083243
  12. Keystone Service Systems, INC

    Case Management Agency · Lancaster, PA · issued Dec 10, 2008

    1598900102
  13. Keystone Service Systems INC

    Community/Behavioral Health Agency · Lebanon, PA · issued Apr 22, 2021

    1073195707
  14. Keystone Service Systems, INC

    Case Management Agency · Lewistown, PA · issued Jan 16, 2009

    1346487071
  15. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Lewistown, PA · issued Jan 25, 2016

    1245697051
  16. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Lewistown, PA · issued Feb 15, 2016

    1104285444
  17. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Mechanicsburg, PA · issued Jan 19, 2016

    1487011615
  18. Keystone Service Systems

    Community/Behavioral Health Agency · Oakdale, PA · issued Sep 16, 2008

    1336398239
  19. Keystone Service Systems

    Community/Behavioral Health Agency · Pittsburgh, PA · issued Sep 12, 2008

    1205085313
  20. Keystone Service Systems, INC

    Occupational Therapy Assistant · State College, PA · issued Apr 3, 2007

    1285755728
  21. Keystone Service Systems, INC

    Community/Behavioral Health Agency · State College, PA · issued Jan 12, 2009

    1124265269
  22. Keystone Service Systems, INC

    Rehabilitation Hospital · Sunbury, PA · issued Mar 23, 2007

    1982721155
  23. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Sunbury, PA · issued Mar 26, 2007

    1306963087
  24. Keystone Service Systems, INC

    Community/Behavioral Health Agency · Sunbury, PA · issued Mar 26, 2009

    1942442694
  25. Keystone Service Systems INC

    Community/Behavioral Health Agency · Sunbury, PA · issued Feb 22, 2016

    1083073852

Source: CMS NPPES monthly file of Aug 9, 2026, organization (Type 2) records.