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 17 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. Pei Casas, M.D.Family Medicine Physician1922234236
  2. Anne Case, MA, MFTMarriage & Family Therapist1073645685
  3. Vicki Casella-Gordon, MS, CNS, RNCritical Care Medicine Registered Nurse1376696617
  4. Megan CaseyMarriage & Family Therapist1992902639
  5. Gwendolyn Cashman, N.P.Adult Health Nurse Practitioner1720057037
  6. Sinai CastanedaMarriage & Family Therapist1992113229
  7. Alexis CastanonBehavior Technician1023687019
  8. Stephanie CastellanosBehavior Technician1144829458
  9. Aiza CastilloBehavior Technician1194582643
  10. Angie CastilloBehavior Technician1356211627
  11. Frank Castillo, NPNurse Practitioner1639623770
  12. India CastilloBehavior Technician1821676552
  13. Joseph Castillo, RADTAddiction (Substance Use Disorder) Counselor1417666991
  14. Myla CastilloPhysical Therapy Assistant1558522680
  15. Priscila CastilloBehavior Technician1508692435
  16. Roger Castillo, PA-CPhysician Assistant1134235773
  17. Sylvia Castillo, LCSWClinical Social Worker1790834844
  18. Ellen CastlemanClinical Social Worker1588791081
  19. Lauren Caston, M.D.Ophthalmology Physician1518296045
  20. Brandon Castro, H.S. DIPLOMABehavior Analyst1457784993
  21. Haylee CastroBehavior Technician1033994181
  22. Jannah Marie CastroBehavior Technician1588536270
  23. Jennifer CastroBehavior Technician1952132847
  24. Jerick CastroBehavior Technician1467276451
  25. Karla Castro, FNPNurse Practitioner1922513050
  26. Regina CastroBehavior Technician1649775453
  27. Travis Castro, R.D.Registered Dietitian1548325202
  28. Maria Emma Castro Lacouture, M.D.Psychiatry Physician1043469687
  29. Beckilynn CatalliPharmacist1447318605
  30. Joy Catolico, MDInternal Medicine Physician1861570954
  31. Stevan Cavalier, MDPediatrics Physician1710065891
  32. Susan Cave-Brown, RN, NPNurse Practitioner1295013928
  33. Kristin Cawley, CNMAdvanced Practice Midwife1669537684
  34. Yesenia CejaBehavior Technician1205713765
  35. David CelioBehavior Technician1467146530
  36. Yuwen CenAcupuncturist1649634684
  37. Melissa CendejasBehavior Technician1407647621
  38. Ben CerasiBehavior Technician1750125662
  39. Martha Cervantes, PTPhysical Therapist1639237787
  40. Trinidad CervantesBehavior Technician1255029179
  41. Yesenia CervantesSchool Psychologist1225950355
  42. Edward Cha, M.D.Anesthesiology Physician1750358800
  43. Susan Cha, M.D.Diagnostic Radiology Physician1346360146
  44. Maria ChaconBehavior Technician1710693056
  45. Less Chafen, M.D.Diagnostic Radiology Physician1336131689
  46. Harkamaljit Chagger, FNPFamily Nurse Practitioner1245007269
  47. Gurveen Chahal, M.D.Internal Medicine Physician1780068775
  48. Shannon ChakedisNurse Practitioner1134527690
  49. Scott Chamberlain, M.D.Emergency Medicine Physician1356395453
  50. Anna ChanBehavior Analyst1356957112

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.