Medicare practitioners by specialty

83 practitioner specialties have at least 300 Medicare-enrolled NPIs. Nurse practitioners are the largest, at 365,671. Each page shows the count in every state and the taxonomy codes that map to the specialty.

1Largest specialty Nurse Practitioner
2Its enrolled NPIs 365,671
3Medicare-enrolled NPIs, all types 2,576,755
4Specialties with a page 83

Medicare-enrolled practitioners (unique NPIs), 20 largest specialties, bars to scale. Source: CMS PPEF, 2026-09-29.

Specialty	Medicare code	Enrolled NPIs	Taxonomy codes
Nurse Practitioner	50	365,671	18
Physician Assistant	97	173,353	3
Internal Medicine	11	128,064	26
Family Practice	08	116,530	10
Physical Therapist in Private Practice	65	113,980	11
Clinical Social Worker	80	99,361	1
Mental Health Counselor	E2	71,777	2
Emergency Medicine	93	64,532	8
Certified Registered Nurse Anesthetist (CRNA)	43	62,632	1
Pediatric Medicine	37	56,331	24
Anesthesiology	05	50,626	6
Optometry	41	46,119	7
Chiropractic	35	45,873	12
Obstetrics/Gynecology	16	42,323	11
Diagnostic Radiology	30	38,230	5
Psychiatry	26	36,906	2
Clinical Psychologist	68	36,498	1
Hospitalist	C6	29,254	1
General Surgery	02	27,817	25
Orthopedic Surgery	20	26,609	8
Cardiovascular Disease (Cardiology)	06	24,625	1
Occupational Therapist in Private Practice	67	24,487	13
Neurology	13	21,541	5
Ophthalmology	18	20,658	5
Gastroenterology	10	18,108	1
Podiatry	48	17,545	8
Marriage and Family Therapist	E1	15,582	1
Dermatology	07	14,942	6
Pathology	22	14,667	16
Qualified Speech Language Pathologist	15	14,333	1
Pulmonary Disease	29	13,597	1
Hematology/Oncology	83	12,233	1
Qualified Audiologist	64	11,754	3
Urology	34	11,621	3
Otolaryngology	04	11,444	8
Registered Dietitian or Nutrition Professional	71	11,323	9
Nephrology	39	11,138	1
Physical Medicine and Rehabilitation	25	10,933	7
Certified Nurse Midwife (Cnm)	42	9,681	1
General Practice	01	9,388	1
Endocrinology	46	8,405	1
Infectious Disease	44	8,336	1
Critical Care (Intensivists)	81	8,039	1
Neurosurgery	14	6,583	1
Rheumatology	66	6,300	1
Dentist	C5	6,038	2
Radiation Oncology	92	5,892	1
Plastic and Reconstructive Surgery	24	5,850	3
Interventional Cardiology	C3	5,759	1
Medical Oncology	90	5,081	1
Vascular Surgery	77	4,625	1
Anesthesiology Assistant	32	4,564	1
Allergy/Immunology	03	4,224	3
Pain Management	72	3,705	1
Oral Surgery	19	3,692	1
Interventional Radiology	94	3,666	2
Thoracic Surgery	33	3,631	1
Cardiac Electrophysiology	21	3,017	1
Hospice/Palliative Care	17	2,980	7
Sports Medicine	23	2,658	10
Geriatric Medicine	38	2,650	2
Certified Clinical Nurse Specialist (Cns)	89	2,230	34
Colorectal Surgery (Proctology)	28	2,061	1
Hand Surgery	40	1,979	3
Interventional Pain Management	09	1,795	1
Cardiac Surgery	78	1,689	1
Surgical Oncology	91	1,618	1
Gynecological Oncology	98	1,366	1
Sleep Medicine	C0	1,328	6
Hematology	82	1,316	1
Osteopathic Manipulative Medicine	12	1,118	2
Maxillofacial Surgery	85	1,083	1
Advanced Heart Failure and Transplant Cardiology	C7	1,048	1
Preventive Medicine	84	1,039	10
Psychologist Billing Independently	62	1,025	24
Addiction Medicine	79	793	4
Nuclear Medicine	36	738	5
Micrographic Dermatologic Surgery (Mds)	D7	618	1
Other (Physician)	99	513	1
Medical Genetics and Genomics	D3	469	5
Neuropsychiatry	86	436	20
Other (Non-Physician)	88	394	0
Epileptologists	F6	361	0

Source: CMS Medicare Fee-For-Service Public Provider Enrollment, extract of 2026-09-29; practitioner provider types (14-xx), unique NPIs. Checked 2026-10-24.