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.

51 to 52 of 52, exact name first

  1. Keystone Service Systems, INC

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

    1033356175
  2. Keystone Service Systems, INC

    Community/Behavioral Health Agency · York, PA · issued Dec 30, 2015

    1396100640

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