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 79 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. Ashley NelsonBehavior Technician1013528389
  2. Lindsay NelsonBehavior Analyst1639471766
  3. Mallory NelsonBehavior Technician1962902288
  4. Marygail Nelson, MSMarriage & Family Therapist1700052883
  5. Parker Nelson, RDRegistered Dietitian1184406795
  6. Eileen NemetzMarriage & Family Therapist1508013954
  7. Francis Nepacena, MDInternal Medicine Physician1457425068
  8. Rebeca Nesicolaci, BCBABehavior Analyst1780070615
  9. Henry Nesis, MDAnesthesiology Physician1881639383
  10. Victoria NessBehavior Technician1033917737
  11. Monika Neuweiler, CRNACertified Registered Nurse Anesthetist1932771938
  12. Manuel NevarezBehavior Technician1164918090
  13. Lataya New-LopezBehavior Technician1730746777
  14. Damon Ng, MDOrthopaedic Surgery Physician1538324140
  15. Jenny NgPharmacist1760914428
  16. Kevin Ng, M.D.Anesthesiology Physician1154394765
  17. Samantha Ng, M.D.Anesthesiology Physician1194996793
  18. Katie Ngan, DC, LACAcupuncturist1457761975
  19. Cassie Ngo, RNAmbulatory Women's Health Care Registered Nurse1639984818
  20. Trang NgoPharmacist1891228391
  21. Rosemond Nguiffo, FNPFamily Nurse Practitioner1063989127
  22. Aywon-Anh NguyenMassage Therapist1457246167
  23. Bach-Kim Nguyen, O.D.Optometrist1942235734
  24. Carly NguyenBehavior Technician1053238238
  25. Catherine Nguyen, M.D.Family Medicine Physician1043660087
  26. Chinh NguyenPharmacist1215311766
  27. Danny NguyenBehavior Technician1275296683
  28. Dawson NguyenBehavior Technician1366380099
  29. Diana Nguyen, PHARM.D.Pharmacist1790931897
  30. Diana NguyenBehavior Technician1932799822
  31. Elizabeth Nguyen, MDEmergency Medicine Physician1639532344
  32. Evonne NguyenBehavior Technician1013523901
  33. Fawnda Nguyen, RNRegistered Nurse1730999004
  34. Fifie NguyenBehavior Technician1235866724
  35. Hai Oanh NguyenPharmacist1629444831
  36. Hong Ngoc Thi NguyenBehavior Technician1538834767
  37. Huu Nguyen, D.O.Internal Medicine Physician1811966492
  38. Jackie Nguyen, MDEmergency Medicine Physician1710627047
  39. Jasmine Nguyen, DOFamily Medicine Physician1871288951
  40. Jessica Nguyen, DOStudent in an Organized Health Care Education/Training Program1184470395
  41. John NguyenBehavior Technician1265179253
  42. Jonathan Nguyen, M.D.Internal Medicine Physician1922549138
  43. Katie NguyenPharmacist1275066151
  44. Melinda Nguyen, DOStudent in an Organized Health Care Education/Training Program1841092681
  45. My-Linh Nguyen, M.D.Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician1790173292
  46. Myhanh Nguyen, N.P.Family Nurse Practitioner1124206453
  47. Nathan Nguyen, M.D.Internal Medicine Physician1861636615
  48. Ngoc-Diep NguyenPharmacist1588952931
  49. Ralph NguyenBehavior Technician1144112418
  50. Sophie Nguyen, NPPrimary Care Nurse Practitioner1194329185

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.