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 76 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. Jennifer WilliamsBehavior Analyst1639670417
  2. Kamina WilliamsBehavior Technician1295236768
  3. Monica WilliamsBehavior Technician1689223448
  4. Regina Williams, RNRegistered Nurse1871430058
  5. Sheena Williams, MPPD, CLE, DSSNutritionist1851223689
  6. Valerie Williams, LCSWClinical Social Worker1679670921
  7. Joy WilliamsonClinical Exercise Physiologist1891587812
  8. Kristen Willison, MDFamily Medicine Physician1306831599
  9. Kira WillowMental Health Counselor1124799879
  10. Kylie Willson-CostaBehavior Technician1710656210
  11. Adam Wilson, PH.D.Clinical Psychologist1619756145
  12. Julia Wilson, RN, PHNRegistered Nurse1710166947
  13. Malia WilsonBehavior Technician1306603097
  14. Michael WilsonAddiction (Substance Use Disorder) Counselor1952882359
  15. Khin Win, DOFamily Medicine Physician1316400559
  16. Richard Winetzky, LMFTMarriage & Family Therapist1134330855
  17. Charles Winkelstein, M.D.Obstetrics & Gynecology Physician1477740769
  18. Judith WinkelsteinSocial Worker1790803146
  19. Sylvia WinnBehavior Technician1346104270
  20. Stephanie WinterBehavior Analyst1942703053
  21. Philip Winters, D.D.S.General Practice Dentistry1477573483
  22. Andrea WisterStudent in an Organized Health Care Education/Training Program1760830913
  23. Charlie WittkeBehavior Analyst1144855560
  24. Emily WojcikStudent in an Organized Health Care Education/Training Program1558090530
  25. Jameson WolfStudent in an Organized Health Care Education/Training Program1790232130
  26. Susan Wolf, M.D.Dermatology Physician1043206261
  27. Jennifer Wolfe, CD, MHTDoula1124359062
  28. George Wolff, DDSGeneral Practice Dentistry1538208442
  29. Leslie Wolff, R.NRegistered Nurse1023468360
  30. Johanna Wolgast, M.D.Family Medicine Physician1558467522
  31. Ji-Hae Won, PHARM.D.Pharmacist1053680223
  32. Alison WongBehavior Analyst1750734869
  33. Brian Wong, D.D.S.Orthodontics and Dentofacial Orthopedics Dentistry1750596888
  34. Caitlin WongBehavior Technician1700459526
  35. Danny WongCommunity Health Worker1699479360
  36. Derek Wong, D.D.SGeneral Practice Dentistry1427367135
  37. Eleanor Wong, PHARMDPharmacist1386914984
  38. Hana WongBehavior Analyst1669309019
  39. Helen Wong, O.T.R./LOccupational Therapist1235496464
  40. Jennifer WongMarriage & Family Therapist1154526168
  41. Lisa Wong, PHARMDPharmacist1114201506
  42. Mark Wong, DC, QMEChiropractor1316067507
  43. Michael Wong, D.D.S.General Practice Dentistry1033220165
  44. Michelle Wong, PT, DPTOrthopedic Physical Therapist1447887856
  45. Stephanie Wong, PH.D.Clinical Psychologist1306108774
  46. Walter Wong, ODOptometrist1689647414
  47. Wesley WongPeer Specialist1831921030
  48. Zachary WongBehavior Technician1750941274
  49. Allison WooMarriage & Family Therapist1356073365
  50. Michael WooBehavior Technician1073253829

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.