NPPES file of Aug 9, 2026

Doctors and health care providers in Walnut Creek, CA

6,170 individual NPPES records list a practice address in Walnut Creek, 23rd of 812 California cities. The largest group is behavior technician: 1,764, 29% of the city's records, against 18% across California. Page 81 of 124.

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

The 8 largest groups in Walnut Creek

Source: CMS NPPES primary taxonomy, file of Aug 9, 2026.

Walnut Creek in California

  • Rank in California23rd of 812 cities by records
  • Share of the state0.6% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups37.6% of all records

Compared with California as a whole, Walnut Creek has 3.5× the state's share of hospitalist physician records and 0.39× its share of mental health counselor records.

Providers in Walnut Creek, alphabetically

  1. Parastoo NowrouziBehavior Technician1841978079
  2. Heather Nudo, PAMOHS-Micrographic Surgery Physician1518077411
  3. Anahy NunezBehavior Technician1912634031
  4. Aaron Nunnery, D.D.S.General Practice Dentistry1932231644
  5. Lauren Nuti, CF-SLPSpeech-Language Pathologist1164044681
  6. Adaobi NwangwuBehavior Technician1679045355
  7. Pauline NyakundiBehavior Technician1528844321
  8. Gina Nye, RNFAMedical-Surgical Registered Nurse1578883096
  9. Linda Nykin, NDNaturopath1134745961
  10. Laura Nystrom, OTR/LPhysical Rehabilitation Occupational Therapist1609502137
  11. Alison O'BrienAthletic Trainer1316637861
  12. Georgette O'BrienMastectomy Fitter1548862378
  13. Brian O'Connor, M.D., MPHInternal Medicine Physician1487087615
  14. Courtney O'ConnorFamily Nurse Practitioner1275352304
  15. Elizabeth O'Connor, PH.D.Psychologist1982614996
  16. Thomas O'Connor-CoatesBehavior Technician1316834690
  17. David O'Dell, MDNeurology Physician1629156708
  18. Katrina O'DellBehavior Technician1285558908
  19. David O'Grady, PH.D.Clinical Psychologist1437375565
  20. Susan O'Grady, PH.D.Clinical Psychologist1437375573
  21. Lindsay O'Kane, DPTPhysical Therapist1952646077
  22. Helen O'Keeffe, MDAnesthesiology Physician1811069560
  23. Ines O'Leary, RDHDental Hygienist1104177328
  24. Jenny O'NeilBehavior Analyst1891158846
  25. Mary O'Neil, M.S., MFTMarriage & Family Therapist1699827782
  26. Eileen O'Neill, CRNACertified Registered Nurse Anesthetist1922157841
  27. Maeve O'Regan, MDInternal Medicine Physician1871535203
  28. Christine Oates, PSYDPsychologist1093342198
  29. Adetoun Obadofin, NPFamily Nurse Practitioner1841964087
  30. Gonzalo Obnial, M.D.Vascular Surgery Physician1497909931
  31. Kristen Obrinsky, P.T.Physical Therapist1851749618
  32. Maria OchoaBehavior Technician1700747342
  33. Priscilla OchoaBehavior Technician1851013601
  34. Daisy Ochoa MacielBehavior Technician1659137644
  35. Jose Ochoa-Bayona, M.D.Hematology & Oncology Physician1669475158
  36. Anna Oconnell, LPCC, BC-DMT, GL-CMAProfessional Counselor1144711698
  37. Brianna OconnorBehavior Technician1124987524
  38. Elizabeth Oconnor, PACPhysician Assistant1356598403
  39. Aryanna OcoroBehavior Technician1730999855
  40. Negus OdameteyBehavior Technician1215743687
  41. Carl OddoAddiction (Substance Use Disorder) Psychologist1154472611
  42. Babak Ofogh, PHARM. D.Pharmacist1538328208
  43. Onome Ogaga, NP-CFamily Nurse Practitioner1952833063
  44. Michael OgunbodedeBehavior Technician1194419432
  45. Timilehin Ogunwole, BSN, RNStudent in an Organized Health Care Education/Training Program1972434173
  46. Christine Oh, MDDiagnostic Radiology Physician1245304559
  47. Cristine Oh, MDPsychiatry Physician1972189686
  48. Jeemeen Oh, L. ACAcupuncturist1053687392
  49. John Oh, MDUrology Physician1649358730
  50. Chiamaka OhaBehavior Technician1831058510

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

Walnut Creek, California appears in the CMS National Plan and Provider Enumeration System with 6,170 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 Walnut Creek - 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 Walnut Creek 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 Walnut Creek is weighted toward Behavior Technician (1,764 clinicians, followed by Marriage & Family Therapist with 315 and Pharmacist with 239). 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, Walnut Creek reports roughly 15.8 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.

Of California's most common specialties, Student in an Organized Health Care Education/Training Program is the most prominent one with no provider currently listing a Walnut Creek practice address, a coverage gap Walnut Creek patients typically fill by traveling to a larger nearby hub.

For Walnut Creek 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 Walnut Creek, CA?

There are 6,170 registered healthcare providers in Walnut Creek, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Walnut Creek?

The most common specialties in Walnut Creek are Behavior Technician, Marriage & Family Therapist, Pharmacist, Behavior Analyst, Internal Medicine Physician. Behavior Technician has the most providers with 1,764.

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.