NPPES file of Aug 9, 2026

Doctors and health care providers in San Mateo, CA

3,909 individual NPPES records list a practice address in San Mateo, 54th of 812 California cities. The largest group is behavior technician: 848, 22% of the city's records, against 18% across California. Page 53 of 79.

CMS NPPES registry, file of Aug 9, 2026 · method · Verify with CMS →

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

San Mateo in California

  • Rank in California54th of 812 cities by records
  • Share of the state0.4% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups35.7% of all records

Compared with California as a whole, San Mateo has 2.5× the state's share of psychiatry physician records and 0.57× its share of family medicine physician records.

Providers in San Mateo, alphabetically

  1. Briana OlivaBehavior Technician1619641768
  2. Lua OlivaBehavior Analyst1033684865
  3. Samantha Oliveira, PA-C, MS, MPHPhysician Assistant1326449893
  4. Diane Oliver, MDInternal Medicine Physician1902286735
  5. Kenneth Oliver, D.C.Chiropractor1033491386
  6. David Olsen, D.C.Chiropractor1447405501
  7. Thomas Olsen, LMFTMarriage & Family Therapist1083067888
  8. Jaclyn OlsonBehavior Technician1104393875
  9. Robert Olson, D.D.S.General Practice Dentistry1538188255
  10. Joseph Onate, PHN, RNRegistered Nurse1174853980
  11. Nuria OntiverosBehavior Technician1487223582
  12. Edward Onuma, M.D.,PHDSpecialist1477559722
  13. Yemon Oo, RNRegistered Nurse1356691281
  14. Maria Irene Ordanza, BCBABehavior Analyst1992293609
  15. Monica Orea DuarteMarriage & Family Therapist1669977625
  16. Donna Ornitz, MDOphthalmology Physician1073528790
  17. Elisa OrozcoCommunity Health Worker1295516565
  18. Gabriel Orozco, R.R.T.Registered Respiratory Therapist1598864985
  19. Richard Orr, DDSDentist1841478310
  20. Deanna OrtaBehavior Technician1912596388
  21. Delicia OrtegaBehavior Analyst1609233584
  22. Heidi OrtegaBehavior Technician1215738711
  23. Adriana OrtizBehavior Technician1497307037
  24. Marcella OrtizPeer Specialist1922831577
  25. Raymond Ortiz, MFTIMarriage & Family Therapist1013384387
  26. Elena Del Rosario Ortiz AlmaguerSocial Worker1457764151
  27. Maritza Ortiz SanchezCase Manager/Care Coordinator1801601976
  28. Joanna OsegueraBehavior Technician1275413536
  29. Emilio OsorioClinical Social Worker1841316577
  30. Aracely OsunaMental Health Counselor1184362857
  31. Glenn Otterman, RPHPharmacist1275819039
  32. Jiayan OuClinical Social Worker1093424525
  33. Alison OuyangStudent in an Organized Health Care Education/Training Program1225818768
  34. Julian Ovtcharov, D.C.Chiropractor1760777817
  35. Monica OwMarriage & Family Therapist1942826912
  36. Audrey Owens, MSPTNeurology Physical Therapist1679723407
  37. Ashley PaciniAddiction (Substance Use Disorder) Counselor1962223297
  38. Gurpreet Padam, M.D.Adult Medicine Physician1932125135
  39. Elizabeth PadillaMarriage & Family Therapist1316707573
  40. Laura PadillaRegistered Nurse1649625666
  41. Jamie Padilla-GriffinMarriage & Family Therapist1467981001
  42. Melody Pagan, RN, MSN, CNLRegistered Nurse1518591726
  43. Jacqueline PagoboMental Health Counselor1336694355
  44. Shweta PahadeBehavior Technician1689229858
  45. Darshana Pai, MDPsychiatry Physician1043716939
  46. Jason Pai, M.D.Diagnostic Radiology Physician1548648827
  47. Regina PalaciosBehavior Technician1891325841
  48. Yajaira PalaciosSocial Worker1831834423
  49. Adam Paley, MDFamily Medicine Physician1346235538
  50. Michelle PalmaBehavior Technician1457197378

The largest California cities

  1. Los Angeles69,537
  2. San Diego52,937
  3. San Francisco38,143
  4. Sacramento33,083
  5. San Jose20,925

All of California →

How to read this directory

San Mateo, California appears in the CMS National Plan and Provider Enumeration System with 3,909 registered healthcare providers spanning 25 or more distinct NUCC-taxonomy specialties. This count includes every individual clinician who has applied for an NPI and listed a practice address in San Mateo - physicians, dentists, nurse practitioners, physician assistants, chiropractors, physical therapists, optometrists, psychologists, podiatrists, and every other credentialed provider type CMS tracks. It does not measure hospital beds, urgent-care capacity, or whether a given clinic is accepting new patients; it measures the pool of professionals with current NPI enrollment and a San Mateo practice location on file. Every figure is drawn from the federal National Provider Identifier Registry (CMS NPPES) - more than 7 million providers, maintained since May 2007, with 2024 Medicare Part D data, and, according to CMS, can be searched, compared, and traced in our methodology.

The provider mix in San Mateo is weighted toward Behavior Technician (848 clinicians, followed by Marriage & Family Therapist with 348 and Behavior Analyst with 200). That distribution reflects how NPPES records specialty: providers self-select a primary taxonomy code, so a family physician who also practices geriatrics will show up under whichever NUCC code they registered first. Relative to California's population, San Mateo reports roughly 10 providers per 100,000 residents using the state-level denominator, which is a rough proxy rather than a precise access-to-care measurement; the true catchment area of any {cityName} clinician extends beyond the municipal boundary.

For San Mateo patients, this directory is most useful as a starting shortlist. Important: PlainDoctor is a directory of publicly available CMS government data, not a review site, a ranking, or medical advice. NPPES data is self-reported and refreshed monthly; call the practice directly to confirm the provider is still there, accepts your insurance, and is taking new patients.

For informational purposes only; this directory is not medical advice and not a substitute for checking a license. See also: how to find a doctor and how to verify one.

Common questions

How many doctors are in San Mateo, CA?

There are 3,909 registered healthcare providers in San Mateo, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in San Mateo?

The most common specialties in San Mateo are Behavior Technician, Marriage & Family Therapist, Behavior Analyst, Mental Health Counselor, Clinical Social Worker. Behavior Technician has the most providers with 848.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov). Records are self-reported registrations, not licenses.

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.