Statewide totals
| Active NPI records | 249,046 |
| Registered sole proprietors | 63,440 (25.5%) |
The sole-proprietor flag is self-reported, so it is an imperfect proxy for private practice. The 25.5% share should be read as the proportion of these active NPI records carrying that flag, not as a definitive measure of independently operating clinicians or practices.
Largest specialties in this state
| Specialty | Active NPIs |
|---|---|
| Mental Health Counselor | 18,727 |
| Clinical Social Worker | 17,487 |
| Student in an Organized Health Care Education/Training Program | 13,220 |
| Behavior Technician | 10,355 |
| Counselor | 9,363 |
| Internal Medicine Physician | 8,624 |
| Physical Therapist | 7,425 |
| Registered Nurse | 6,036 |
| Pharmacist | 5,881 |
| Social Worker | 5,775 |
| Developmental Therapist | 5,335 |
| General Practice Dentistry | 4,967 |
| Behavior Analyst | 4,581 |
| Physician Assistant | 4,275 |
| Family Nurse Practitioner | 4,084 |
| Speech-Language Pathologist | 4,032 |
| Dentist | 3,723 |
| Occupational Therapist | 3,622 |
| Pediatrics Physician | 3,274 |
| Nurse Practitioner | 3,210 |
| Clinical Psychologist | 3,205 |
| Psychiatry Physician | 2,871 |
| Addiction (Substance Use Disorder) Counselor | 2,712 |
| Family Medicine Physician | 2,558 |
| Psychologist | 2,487 |
| Chiropractor | 2,470 |
| Registered Dietitian | 2,383 |
| Optometrist | 2,104 |
| Case Manager/Care Coordinator | 2,053 |
| Anesthesiology Physician | 1,944 |
| Home Health Agency | 1,886 |
| Emergency Medicine Physician | 1,806 |
| Specialist | 1,728 |
| Psychiatric/Mental Health Nurse Practitioner | 1,690 |
| Diagnostic Radiology Physician | 1,511 |
| Licensed Practical Nurse | 1,476 |
| Acupuncturist | 1,471 |
| Adult Health Nurse Practitioner | 1,449 |
| Durable Medical Equipment & Medical Supplies | 1,352 |
| Community/Behavioral Health Agency | 1,309 |
Common questions
What does the total represent?
It represents 249,046 active NPI records with a practice location in Massachusetts.
What is the largest specialty listed?
Mental Health Counselor is the largest listed specialty, with 18,727 records.
Does the sole-proprietor share measure private practice exactly?
No. The flag is self-reported and is an imperfect proxy for private practice.
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