NPI Desk

States / California

CA · #1 of 51 by enrolled NPIs

Medicare providers in California

261,702 unique NPIs are enrolled in Medicare in California, number 1 of 51. Practitioners in the 82 specialties tracked here account for 210,055 of them; the largest is nurse practitioner (22,920), and nurse practitioners outnumber family-practice physicians 1.5 to 1.

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24JNPI1234567893207Q00000XCalifornia1234
  1. 1Enrolled NPIs 261,702
  2. 2Largest specialty Nurse Practitioner
  3. 3Rank of 51 #1
  4. 4Specialties present 82
Nurse Practitioner22,920Internal Medicine17,707Family Practice15,099Physician Assistant14,580Physical Therapist in...11,430Emergency Medicine8,550Marriage and Family...8,306Clinical Social Worker8,165Pediatric Medicine7,718Anesthesiology7,228Psychiatry5,852Diagnostic Radiology5,540Optometry5,425Clinical Psychologist5,417Obstetrics/Gynecology5,326
Medicare-enrolled practitioners in California by specialty, 15 largest, bars to scale. Source: CMS PPEF, 2026-09-29.

Every specialty in California

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

SpecialtyCAShare of US
Nurse Practitioner22,9206.3%
Internal Medicine17,70713.8%
Family Practice15,09913%
Physician Assistant14,5808.4%
Physical Therapist in Private Practice11,43010%
Emergency Medicine8,55013.2%
Marriage and Family Therapist8,30653.3%
Clinical Social Worker8,1658.2%
Pediatric Medicine7,71813.7%
Anesthesiology7,22814.3%
Psychiatry5,85215.9%
Diagnostic Radiology5,54014.5%
Optometry5,42511.8%
Clinical Psychologist5,41714.8%
Obstetrics/Gynecology5,32612.6%
Chiropractic3,6938.1%
Orthopedic Surgery3,01911.3%
General Surgery2,94610.6%
Hospitalist2,93510%
Ophthalmology2,93414.2%
Certified Registered Nurse Anesthetist (CRNA)2,8404.5%
Neurology2,76112.8%
Cardiovascular Disease (Cardiology)2,45510%
Dermatology2,24715%
Podiatry2,02711.6%
Gastroenterology1,90210.5%
Pathology1,64911.2%
Occupational Therapist in Private Practice1,6096.6%
Otolaryngology1,48313%
Urology1,41212.2%
Hematology/Oncology1,40911.5%
Pulmonary Disease1,2479.2%
Nephrology1,23611.1%
Physical Medicine and Rehabilitation1,22211.2%
Qualified Speech Language Pathologist1,2008.4%
Mental Health Counselor9751.4%
General Practice94310%
Endocrinology92811%
Critical Care (Intensivists)89511.1%
Infectious Disease87410.5%
Qualified Audiologist8547.3%
Certified Nurse Midwife (Cnm)8178.4%
Dentist80413.3%
Registered Dietitian or Nutrition Professional8027.1%
Plastic and Reconstructive Surgery77213.2%
Neurosurgery76511.6%
Rheumatology73111.6%
Oral Surgery66618%
Radiation Oncology65411.1%
Interventional Radiology57115.6%
Allergy/Immunology54412.9%
Vascular Surgery52511.4%
Pain Management40911%
Interventional Cardiology3876.7%
Medical Oncology3797.5%
Hospice/Palliative Care37712.7%
Thoracic Surgery3419.4%
Geriatric Medicine32812.4%
Cardiac Electrophysiology2387.9%
Preventive Medicine23222.3%
Surgical Oncology22113.7%
Other (Physician)20740.4%
Colorectal Surgery (Proctology)2039.8%
Sports Medicine2027.6%
Cardiac Surgery20111.9%
Psychologist Billing Independently17617.2%
Hand Surgery1728.7%
Sleep Medicine16012%
Nuclear Medicine15521%
Osteopathic Manipulative Medicine15413.8%
Hematology15011.4%
Interventional Pain Management1488.2%
Gynecological Oncology1289.4%
Maxillofacial Surgery857.8%
Advanced Heart Failure and Transplant Cardiology797.5%
Addiction Medicine759.5%
Medical Genetics and Genomics6213.2%
Micrographic Dermatologic Surgery (Mds)447.1%
Neuropsychiatry419.4%
Other (Non-Physician)369.1%
Epileptologists308.3%
Certified Clinical Nurse Specialist (Cns)261.2%

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