Medicare providers in Massachusetts

84,062 unique NPIs are enrolled in Medicare in Massachusetts, number 12 of 51. Practitioners in the 82 specialties tracked here account for 69,815 of them; the largest is nurse practitioner (11,919), and nurse practitioners outnumber family-practice physicians 6 to 1.

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1Enrolled NPIs 84,062
2Largest specialty Nurse Practitioner
3Rank of 51 #12
4Specialties present 82

Medicare-enrolled practitioners in Massachusetts by specialty, 15 largest, bars to scale. Source: CMS PPEF, 2026-09-29.

Every specialty in Massachusetts

Each figure is the number of NPIs enrolled in Medicare in Massachusetts under that specialty, beside its share of the specialty's national total.

Specialty	MA	Share of US
Nurse Practitioner	11,919	3.3%
Physician Assistant	5,987	3.5%
Clinical Social Worker	5,337	5.4%
Internal Medicine	5,234	4.1%
Physical Therapist in Private Practice	3,496	3.1%
Mental Health Counselor	2,715	3.8%
Pediatric Medicine	2,084	3.7%
Psychiatry	2,042	5.5%
Family Practice	1,975	1.7%
Anesthesiology	1,975	3.9%
Diagnostic Radiology	1,943	5.1%
Emergency Medicine	1,924	3%
Clinical Psychologist	1,869	5.1%
Certified Registered Nurse Anesthetist (CRNA)	1,563	2.5%
Optometry	1,287	2.8%
Obstetrics/Gynecology	1,241	2.9%
Neurology	1,019	4.7%
Cardiovascular Disease (Cardiology)	929	3.8%
Chiropractic	887	1.9%
Hospitalist	874	3%
Orthopedic Surgery	856	3.2%
General Surgery	769	2.8%
Ophthalmology	709	3.4%
Pathology	683	4.7%
Gastroenterology	650	3.6%
Dermatology	620	4.1%
Pulmonary Disease	515	3.8%
Hematology/Oncology	507	4.1%
Endocrinology	445	5.3%
Occupational Therapist in Private Practice	444	1.8%
Certified Nurse Midwife (Cnm)	410	4.2%
Registered Dietitian or Nutrition Professional	393	3.5%
Podiatry	386	2.2%
Qualified Audiologist	377	3.2%
Infectious Disease	375	4.5%
Otolaryngology	346	3%
Urology	340	2.9%
Nephrology	333	3%
Medical Oncology	332	6.5%
Physical Medicine and Rehabilitation	297	2.7%
Certified Clinical Nurse Specialist (Cns)	243	10.9%
Rheumatology	242	3.8%
Radiation Oncology	242	4.1%
Critical Care (Intensivists)	230	2.9%
Qualified Speech Language Pathologist	227	1.6%
Neurosurgery	179	2.7%
Allergy/Immunology	179	4.2%
Plastic and Reconstructive Surgery	177	3%
Vascular Surgery	156	3.4%
Oral Surgery	150	4.1%
Dentist	137	2.3%
Thoracic Surgery	129	3.6%
Hospice/Palliative Care	126	4.2%
Marriage and Family Therapist	118	0.8%
Geriatric Medicine	117	4.4%
Interventional Cardiology	79	1.4%
Cardiac Electrophysiology	76	2.5%
Interventional Radiology	73	2%
Sports Medicine	73	2.7%
Hematology	71	5.4%
General Practice	60	0.6%
Hand Surgery	60	3%
Surgical Oncology	60	3.7%
Colorectal Surgery (Proctology)	55	2.7%
Pain Management	54	1.5%
Advanced Heart Failure and Transplant Cardiology	53	5.1%
Cardiac Surgery	51	3%
Maxillofacial Surgery	51	4.7%
Addiction Medicine	43	5.4%
Sleep Medicine	40	3%
Gynecological Oncology	28	2%
Medical Genetics and Genomics	28	6%
Epileptologists	27	7.5%
Preventive Medicine	22	2.1%
Nuclear Medicine	20	2.7%
Osteopathic Manipulative Medicine	14	1.3%
Micrographic Dermatologic Surgery (Mds)	12	1.9%
Interventional Pain Management	11	0.6%
Other (Non-Physician)	8	2%
Neuropsychiatry	4	0.9%
Psychologist Billing Independently	2	0.2%
Anesthesiology Assistant	1	0%

Source: CMS Medicare Fee-For-Service Public Provider Enrollment, extract of 2026-09-29; unique NPIs per state. Checked 2026-10-24. Methodology.