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 18 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. Carrie Chan, CPNPPediatric Nurse Practitioner1538413117
  2. Debbie Chan, MPAPhysician Assistant1891084117
  3. Eugene Chan, MDGastroenterology Physician1528146610
  4. Fiona ChanMarriage & Family Therapist1215491931
  5. Jennifer Chan, M.D.Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician1265634687
  6. Joseph Chan, M.D.Diagnostic Radiology Physician1043256720
  7. Leslie Chan, O.D.Optometrist1962603761
  8. Lily Chan, RPHPharmacist1962950576
  9. Lina Chan, ODOptometrist1659358042
  10. Ronald Chan, M.D.Diagnostic Radiology Physician1154367993
  11. Sidney Chan, MDDiagnostic Radiology Physician1427136522
  12. Stephanie Chan, ODOptometrist1689635542
  13. Stephanie Chan, FNP-BCNurse Practitioner1477280030
  14. Susan Chan, DDSDentist1043313570
  15. Wai Kuan ChanPharmacist1467984815
  16. Wesley Chan, M.D.Preventive Medicine/Occupational Environmental Medicine Physician1740214899
  17. Naveen Chandra, MDOphthalmology Physician1740352558
  18. Smita Chandra, M.D.Internal Medicine Physician1811917826
  19. Andrew Chang, MDInternal Medicine Physician1477632131
  20. Cecil Chang, M.D.Pediatrics Physician1215178728
  21. Ching Chang, MDFamily Medicine Physician1174545909
  22. Ching-Kuo Chang, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1871671925
  23. E. Cheng-Hsin Chang, DDSGeneral Practice Dentistry1598977225
  24. Han Kyo Chang, M.DInternal Medicine Physician1235127150
  25. Heidi Chang, MDObstetrics & Gynecology Physician1649681982
  26. Jane Chang, PHARMDPharmacist1770066946
  27. Judy Chang, O.D.Optometrist1316090384
  28. Katherine Chang, NPNurse Practitioner1679357248
  29. Leatrice Chang, MDFamily Medicine Physician1700822053
  30. Lisbeth ChangClinical Social Worker1295272359
  31. Melinda Chang, MS, CGCGenetic Counselor (M.S.)1790466209
  32. Michael Chang, D.O.Pain Medicine (Physical Medicine & Rehabilitation) Physician1205934262
  33. Nancy Chang, MDInternal Medicine Physician1184702284
  34. Natalie Chang, M.D.Internal Medicine Physician1548370786
  35. Natalie Chang, D.O.Internal Medicine Physician1205018561
  36. Randall Chang, D.D.S.Pediatric Dentistry1205961372
  37. Richard Chang, M.D.Interventional Cardiology Physician1275669954
  38. Ross Chang, PHARMDPharmacist1285166942
  39. Ruby Chang, M.D.Diagnostic Radiology Physician1164459335
  40. S. Ming Chang, M.D.Pediatrics Physician1114996618
  41. Steven Chang, M.D.Anesthesiology Physician1427090414
  42. Suyi Chang, MDGastroenterology Physician1972681468
  43. Suzanne Chang, MDInternal Medicine Physician1730373119
  44. Elena ChangalaBehavior Technician1114850831
  45. Sompheat ChanhpaseuthBehavior Technician1144009291
  46. Cooper Chao, MDAnesthesiology Physician1609818608
  47. Jasmine ChaoBehavior Technician1053927822
  48. Kuang-Hwa Chao, M.D.Radiation Oncology Physician1073721569
  49. Zehour ChaouiBehavior Technician1083482152
  50. Danielle Chapman, NPNurse Practitioner1720930217

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.