NPI numbers in Massachusetts
258,607 active NPIs list a practice location in Massachusetts.
222,151 individuals and 36,456 organizations. Massachusetts ranks #10 of 56 states and territories.
Look up a provider in Massachusetts
Most common specialties in Massachusetts
| Primary specialty | Active NPIs | Share |
|---|---|---|
| Mental Health Counselor | 19,770 | 7.6% |
| Clinical Social Worker | 19,048 | 7.4% |
| Behavior Technician | 11,597 | 4.5% |
| Student in an Organized Health Care Education/Training Program | 11,082 | 4.3% |
| Counselor | 9,128 | 3.5% |
| Physical Therapist | 7,781 | 3.0% |
| Internal Medicine Physician | 7,625 | 2.9% |
| Pharmacist | 6,000 | 2.3% |
| Social Worker | 5,618 | 2.2% |
| Developmental Therapist | 5,256 | 2.0% |
| General Practice Dentistry | 5,252 | 2.0% |
| Behavior Analyst | 5,070 | 2.0% |
| Registered Nurse | 5,020 | 1.9% |
| Family Nurse Practitioner | 4,815 | 1.9% |
| Physician Assistant | 4,756 | 1.8% |
Counts are active NPIs in the NPPES file of September 13, 2026, by the state of the practice location and each provider's primary specialty. They count records, not practicing clinicians.