NPPES file of Aug 9, 2026

Doctors and health care providers in Oakland, CA

18,558 individual NPPES records list a practice address in Oakland, 7th of 812 California cities. The largest group is marriage & family therapist: 1,576, 8% of the city's records, against 6% across California. Page 84 of 372.

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

The 8 largest groups in Oakland

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

Oakland in California

  • Rank in California7th of 812 cities by records
  • Share of the state1.9% of California's records
  • Specialties present25 or more taxonomy codes
  • Top three groups22.2% of all records
  • Marriage & Family Therapist rank5th of the 10 California cities with the most

Compared with California as a whole, Oakland has 2.9× the state's share of counselor records and 0.29× its share of behavior technician records.

Providers in Oakland, alphabetically

  1. Patrick Diaz, M.D.Pediatrics Physician1467660233
  2. Stephanie Diaz, M.S.Genetic Counselor (M.S.)1447325394
  3. Teresa Diaz, MDObstetrics & Gynecology Physician1194735753
  4. Vanessa Diaz, RNAmbulatory Care Registered Nurse1801351432
  5. Francisco Javier Diaz Diaz, M.D.Family Medicine Physician1497946313
  6. Vanessa Diaz KromerMarriage & Family Therapist1578347456
  7. Daisy Diaz RochaClinical Social Worker1942757059
  8. Karla Diaz SerranoMarriage & Family Therapist1811645906
  9. Yulissa Diaz TafollaStudent in an Organized Health Care Education/Training Program1770238446
  10. Emilio Diaz-RoblesBehavior Technician1528666948
  11. Sarah Dibas, BCATBehavior Technician1225859036
  12. Mohamed DibsyHealth Information Technician1730811241
  13. Molly Dibsy, LCSWClinical Social Worker1043725930
  14. Nicholas Dicarlo, LCSWClinical Social Worker1336656669
  15. Christopher Dickens, M.D.Ophthalmology Physician1962560326
  16. Denise DickensSpecialist1699543611
  17. Michael DickersonMental Health Counselor1346576097
  18. Cheryl DickinsonAssistant Behavior Analyst1811446784
  19. Joseph Dickinson, DPMFoot & Ankle Surgery Podiatrist1083988844
  20. Michael Dickman, M.S.Marriage & Family Therapist1679124234
  21. Jennifer DicksonMental Health Counselor1881846517
  22. Tracy DicksonLicensed Vocational Nurse1396267985
  23. Barbara Dicostanzo, PTPhysical Therapist1811062276
  24. Ron Dieckmann, M.D.Emergency Medicine Physician1306973615
  25. Jeffrey Dieden, MDVascular & Interventional Radiology Physician1922186717
  26. Joan DiedrichCommunity Health Worker1609201383
  27. Jennifer Diemunsch, RNRegistered Nurse1356037402
  28. Adrienne Dienst, ASW, MSWClinical Social Worker1669794442
  29. Henry Diep, DMDGeneral Practice Dentistry1174193643
  30. Susan Diep, RPHPharmacist1083138093
  31. Ole Dierks, M.D.Nephrology Physician1740221514
  32. Zachary DiestlerMarriage & Family Therapist1336835768
  33. Edwin Dietrich, MDEmergency Medical Services (Emergency Medicine) Physician1710221403
  34. Adam Dietz, MSW, MPHSocial Worker1861862013
  35. Hans DietzeMassage Therapist1275148033
  36. James Diffley, M.D.Pediatrics Physician1780974626
  37. Michael Digiacomo, DPMFoot & Ankle Surgery Podiatrist1558377465
  38. Carla Digiulio, CRNAStudent in an Organized Health Care Education/Training Program1609014463
  39. Jennifer Dijaili, PHARMDPharmacist1922689785
  40. Jasmine DildyCase Manager/Care Coordinator1932510575
  41. Gayathri Dileep, MDStudent in an Organized Health Care Education/Training Program1952198558
  42. Maggie Dill, CMTMassage Therapist1821422999
  43. Lauren DillardMental Health Counselor1073756094
  44. Michael Dillon, M.D.Emergency Medicine Physician1063436111
  45. Ruth Christine Dimagmaliw, LMFTMarriage & Family Therapist1295255495
  46. Marie Dimalanta, P.A.Surgical Physician Assistant1255492807
  47. John Dimartini, PH.D.Psychologist1063764090
  48. Juanita Dimas, PH.D.Clinical Psychologist1316107774
  49. Rika DimickStudent in an Organized Health Care Education/Training Program1942411384
  50. Heather Dinh, D.D.S.General Practice Dentistry1154798866

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

Oakland, California appears in the CMS National Plan and Provider Enumeration System with 18,558 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 Oakland - 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 Oakland 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 Oakland is weighted toward Marriage & Family Therapist (1,576 clinicians, followed by Student in an Organized Health Care Education/Training Program with 1,419 and Clinical Social Worker with 1,130). 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, Oakland reports roughly 47.6 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, General Practice Dentistry is the most prominent one with no provider currently listing a Oakland practice address, a coverage gap Oakland patients typically fill by traveling to a larger nearby hub.

For Oakland 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 Oakland, CA?

There are 18,558 registered healthcare providers in Oakland, CA, covering 25 or more specialties. This includes physicians, dentists, therapists, and other licensed providers.

What are the most common medical specialties in Oakland?

The most common specialties in Oakland are Marriage & Family Therapist, Student in an Organized Health Care Education/Training Program, Clinical Social Worker, Mental Health Counselor, Behavior Technician. Marriage & Family Therapist has the most providers with 1,576.

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.