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 246 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. Katharine O'Donnell, MSWCounselor1104268127
  2. Myles O'Donnell, DCChiropractor1811623499
  3. James O'DriscollMental Health Counselor1194069476
  4. Janellen O'HaraCommunity Health Worker1003059817
  5. Patrick O'Hearn, PH.D.Clinical Psychologist1245307529
  6. Brian O'Kelly, MDCardiovascular Disease Physician1023196722
  7. Mary O'Leary, CRNACertified Registered Nurse Anesthetist1235698929
  8. Colin O'MalleyDay Training/Habilitation Specialist1669282869
  9. Kerynne O'MalleyMarriage & Family Therapist1316790116
  10. Heather O'Moore, DCChiropractor1770321945
  11. Bruce O'Neil, M.D.Internal Medicine Physician1255399580
  12. Deidre O'Neill, MSWSocial Worker1295113181
  13. Gavin O'NeillAddiction (Substance Use Disorder) Counselor1376033159
  14. Savannah O'NeillAddiction (Substance Use Disorder) Counselor1003176637
  15. Shawna O'Neill, MAMental Health Counselor1235392465
  16. Keegan O'RavezRegistered Nurse1487349486
  17. Emily O'Rourke, M.D.Anatomic Pathology & Clinical Pathology Physician1437492386
  18. Felice O'Ryan, DDSOral and Maxillofacial Surgery (Dentist)1255419834
  19. Caroline O'Sullivan, MFTIMental Health Counselor1679823579
  20. Clare O'TooleMarriage & Family Therapist1508006511
  21. Julian OakleyCommunity Health Worker1053199679
  22. Rosesharon OatesMassage Therapist1861882623
  23. Demetrie OaxtonMental Health Counselor1316211485
  24. Edward Obbard, PSY.D.Clinical Psychologist1912185315
  25. Sara Obeid, MD, MPHInternal Medicine Physician1619400678
  26. Ainsley ObenausDay Training/Habilitation Specialist1700696994
  27. Charles ObengDriver1699435107
  28. Hargun OberaiFoot & Ankle Surgery Podiatrist1841824265
  29. Adrienne Oberstein, M.S.Mental Health Counselor1295873610
  30. Ogochukwu ObiStudent in an Organized Health Care Education/Training Program1972076131
  31. Bianca Obiakor, MDStudent in an Organized Health Care Education/Training Program1902607161
  32. Cajethan Obidah, LMFTMarriage & Family Therapist1851050561
  33. Susana ObispoAddiction (Substance Use Disorder) Counselor1619426475
  34. Elizabeth Obolensky, M.S.Genetic Counselor (M.S.)1316008584
  35. Diana Obrinsky, M.D.Pediatrics Physician1780705871
  36. Theodor ObukhovBehavior Technician1023898871
  37. Jennifer ObyrneMental Health Counselor1962845495
  38. Danica Ariel OcampoBehavior Technician1811552342
  39. Salvador Oceguera, DCChiropractor1316876279
  40. Cristal OchoaBehavior Technician1952244980
  41. Edna OchoaRegistered Nurse1578173423
  42. Karie Ochoa, MSWClinical Social Worker1952778508
  43. Richard Ochoa, PAEmergency Clinical Nurse Specialist1316928088
  44. Ruth Ochoa, M.D.Hospice and Palliative Medicine (Emergency Medicine) Physician1508028481
  45. Timothy OchoaStudent in an Organized Health Care Education/Training Program1770385692
  46. Veronica OchoaClinical Social Worker1831300565
  47. Joy Octaviano, MS, RN, AOCNSOncology Registered Nurse1578921565
  48. Maddy Oden, DOULA CERTIFICATIONCommunity Health Worker1871163758
  49. Noah Oderberg, PH.D.Marriage & Family Therapist1508997206
  50. Mireia OdlinStudent in an Organized Health Care Education/Training Program1306494570

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.