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 70 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. Adam Marre, MD, DDSOral & Maxillofacial Surgery (D.M.D.)1013258441
  2. Andrew Marshall, DDSDentist1710198296
  3. Gregory Marshall, MDUrology Physician1437237526
  4. Kristi Marshall, MFTMarriage & Family Therapist1104141951
  5. Aimee Martel, DPT, PTPhysical Therapist1124208483
  6. Ada MartinBehavior Technician1477497808
  7. Ardis Martin, M.D.Child & Adolescent Psychiatry Physician1831237098
  8. Brandon MartinBehavior Technician1912799594
  9. Carmen MartinBehavior Analyst1619242344
  10. Dwayne Martin, DDSPeriodontics1558446773
  11. Jose Martin, MAMarriage & Family Therapist1730338880
  12. Malia MartinBehavior Technician1205436631
  13. Sean Martin, M.D.Surgery Physician1376612275
  14. Wayne Martin, ODOptometrist1689647620
  15. Adriana MartinezClinical Social Worker1326325101
  16. Amaya MartinezBehavior Technician1124658273
  17. Andrea MartinezBehavior Technician1336939537
  18. Christine Martinez, P.A.-CSurgical Physician Assistant1871650523
  19. Damaris MartinezBehavior Technician1689371874
  20. Gabriella MartinezBehavior Technician1295297711
  21. Gustavo Martinez, PT, DPTPhysical Therapist1306608955
  22. Hector MartinezFamily Medicine Physician1255951539
  23. Ina MartinezBehavior Technician1548866122
  24. Jessica MartinezBehavior Technician1639936800
  25. Julian MartinezBehavior Technician1215622477
  26. Julie MartinezBehavior Technician1265180749
  27. Liliana MartinezBehavior Technician1992402176
  28. Melissa MartinezBehavior Technician1366391989
  29. Monica MartinezMarriage & Family Therapist1790491843
  30. Rebeka MartinezBehavior Technician1629884317
  31. Rosalia MartinezBehavior Technician1093410649
  32. Sabrina Martinez, MDAnesthesiology Physician1366516643
  33. Silvia MartinezBehavior Technician1124868690
  34. Mary Martino, MDPediatrics Physician1619049442
  35. Bruce Marts, DOEmergency Medicine Physician1679651707
  36. Lynne Martz, DDSGeneral Practice Dentistry1932310331
  37. Samantha MarucutBehavior Technician1699546804
  38. Christopher Mascarinas, M.D.Otolaryngology Physician1952596744
  39. Trevor MaslandBehavior Technician1588165856
  40. Douglas Mason, MDOrthopaedic Surgery Physician1811075971
  41. Kelly Mason, M.S., CCC-SLPSpeech-Language Pathologist1003807926
  42. Tina Masoudi, AMFTMarriage & Family Therapist1033092861
  43. Jason Massa, D.O.Neurology Physician1841636156
  44. Natalie MassaBehavior Technician1073449294
  45. Ilaria Mastroserio, PA-CPhysician Assistant1376197590
  46. Michelle Masuda, DDS, MSDOrthodontics and Dentofacial Orthopedics Dentistry1114285871
  47. Mika MasudaStudent in an Organized Health Care Education/Training Program1104518588
  48. Mari MasunagaBehavior Technician1649821141
  49. Alana MatayoshiClinical Social Worker1376992214
  50. Christina MathiesonMarriage & Family Therapist1841848231

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.