NPI Lookup · Massachusetts

Massachusetts NPI lookup

256,266 active providers and organizations hold NPIs registered in Massachusetts: 220,213 individual clinicians and 36,053 organizations, across 885 cities. Search them by name, free, no signup.

256,266
Active NPIs in Massachusetts
220,213
Individual clinicians
36,053
Organizations
885
Cities with a registered provider
Where they are

Where Massachusetts's providers are registered

Registry counts by practice city and primary specialty. The count is the finding: it's the size of the ground a rep covers here.

Most NPIs by city

Boston44,038
Worcester14,516
Springfield9,361
Cambridge5,768
Brockton4,980
Milford3,647
Framingham3,569
Fall River3,558
Lowell3,457
Newton3,334

Most common specialties

Mental Health Counselor19,499
Clinical Social Worker17,938
Student in an Organized Health Care Education/Training Program13,753
Behavior Technician11,313
Counselor9,543
Internal Medicine Physician8,644
Physical Therapist7,628
Registered Nurse6,311
Pharmacist5,997
Social Worker5,846
Where this data comes from. Provider identity, specialty, and practice location come from CMS's public NPPES registry (the National Plan & Provider Enumeration System), the official record of every NPI ever issued. Deactivated NPIs are excluded. Addresses are what the provider filed and can lag a move. Where a profile shows Medicare context, it comes from CMS's public utilization, Part D, and Open Payments files: traditional Medicare fee-for-service only, and CMS suppresses any provider-and-code line under 11 beneficiaries before publishing. An Open Payments record is a disclosed relationship, not evidence a clinician uses a product. Prospect 811 organizes public data; it doesn't add to or alter it. Not affiliated with or endorsed by CMS. Full detail on the data page.

Looking for another state? Back to the national NPI lookup.

A registry counts Massachusetts's providers. A rep needs the right 5.

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