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 19 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. Fred Diercks, DDSDentist1215943071
  2. Paul Diercks, DDSDentist1326055005
  3. Shelby DiethelmBehavior Technician1669838173
  4. Randy Dillard, ACSW, MSWSocial Worker1447934906
  5. Valerie Diluggo, M.A.Marriage & Family Therapist1366847642
  6. Ellen DimasBehavior Technician1093579922
  7. Mary Dini, D.D.S.Dentist1518209931
  8. Elizabeth Dinman, M.S., CCC-SLPSpeech-Language Pathologist1275827388
  9. Juleanne Clarice Dino, ODOptometrist1730866161
  10. Christopher Dirks, LMFTMarriage & Family Therapist1154478303
  11. Suzanne Dito, LMFTMarriage & Family Therapist1851984132
  12. Elyse DixonBehavior Analyst1265062897
  13. Mark Dizon, CAMTC 89825Massage Therapist1528786118
  14. Mikka DizonBehavior Analyst1306359666
  15. Marina Djordjevic, BTBehavior Technician1124895099
  16. Mary Dobbins, M.D.Internal Medicine Physician1407837693
  17. Nicole DobelCounselor1588703805
  18. Geraldine DohertyCase Manager/Care Coordinator1376724161
  19. Claudia Dolin, MFTMarriage & Family Therapist1598988388
  20. Monica Dominguez, LCSW-C, LCSWClinical Social Worker1336626928
  21. Kristin Donato, MFTMarriage & Family Therapist1073020202
  22. Melody Donboli, MFTMarriage & Family Therapist1356583348
  23. Katareena DoneStudent in an Organized Health Care Education/Training Program1851940928
  24. Sierra DoneganBehavior Technician1033785779
  25. Alice DongPsychiatry Physician1558006023
  26. Cynthia Donis, M.S.Marriage & Family Therapist1790941813
  27. Hayley Donley-AhlvinBehavior Technician1578453346
  28. Roberto DonlucasAddiction (Substance Use Disorder) Counselor1942670393
  29. Sean Donnelly, PEER SUPPORT SPECIALAddiction (Substance Use Disorder) Counselor1255229530
  30. Rose-Anne Donner, PH.DPsychologist1215027354
  31. Kathleen Donohue, PH.D.Clinical Psychologist1619229150
  32. Dade Donovan, DCChiropractor1225092570
  33. Margaret DoughertyMarriage & Family Therapist1831718584
  34. Adia DouglasBehavior Technician1265059679
  35. Diana Douglass, MDObstetrics & Gynecology Physician1457421901
  36. Sarah DoungBehavior Technician1942069612
  37. Paulette DowAddiction (Substance Use Disorder) Counselor1861930885
  38. Christa Downing-LaurenceBehavior Technician1134687957
  39. Brooke DoyleBehavior Technician1033996269
  40. Michael Drinnan, MDOphthalmology Physician1609883024
  41. Yao DuSpeech-Language Pathologist1417401563
  42. Amie Dubois, RNPWomen's Health Nurse Practitioner1285838136
  43. Isabel DuboisBehavior Technician1437876497
  44. Ana Duenas, PPSSchool Counselor1841144797
  45. Wendee Duhon, NPNurse Practitioner1134299605
  46. Luciana DukeBehavior Technician1851053607
  47. Anna DukovicMental Health Counselor1952921975
  48. Madison Dumpprope, RNCase Management Registered Nurse1063371540
  49. Nathaniel Duncan, PHARMDPharmacist1740647619
  50. Melissa Duncanson, MDObstetrics & Gynecology Physician1144753443

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.