NPPES file of Aug 9, 2026

Specialist in California

5,749 NPPES records list specialist with a practice address in California, 15 per 100,000 residents, the 19th highest rate of 51. San Francisco and Los Angeles have the most; each record links to the provider's NPI and the California license search. Page 74 of 115.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 174400000X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

San Francisco has the most, 666

  1. San Francisco666
  2. Los Angeles301
  3. Sacramento241
  4. San Diego207
  5. Oakland198

Specialist records in California

  1. Eva OchoaSacramento, CA 958171104664549
  2. Kristen Ochoa, M.D.Torrance, CA 905091063629343
  3. Nataly Ochoa, D.P.T.Porter Ranch, CA 913261295071306
  4. Priscilla OchoaFresno, CA 937261477985661
  5. Breanna OdnealLakeport, CA 954531992584866
  6. Michael Odonnell, MDLong Beach, CA 908221346320264
  7. Michael Oest, CPOWhittier, CA 906061992996581
  8. Yael Oestreicher-Kedem, MDStanford, CA 943051790944528
  9. Joshua Ofman, M.D.Thousand Oaks, CA 913201245504976
  10. Lydia Oftadeh, MDCudahy, CA 902011912964255
  11. Charles Oh, M.D.Tustin, CA 927801780689042
  12. Maxwell Ohikhuare, M.D.Moreno Valley, CA 925551447320817
  13. Andrew OjedaReseda, CA 913351447097902
  14. Lukachukwu Ojemaye, D.P.TMenlo Park, CA 940251861851214
  15. Adebambo Ojuri, M.D.Los Angeles, CA 900451679644983
  16. Osinachi Okakpu, MPHSan Francisco, CA 941031770077315
  17. Eric Okamoto, M.D.Fremont, CA 945361588787097
  18. Mariko OkamotoGilroy, CA 950201568163103
  19. Cynthia OkialdaOakland, CA 946111558218784
  20. Cornelius Olcott, M.D.Stanford, CA 943051457439515
  21. Marlisa Olea-GallardoSacramento, CA 958171104637990
  22. Jennifer OlingerSan Jose, CA 951261437660727
  23. David Oliphant, ATCModesto, CA 953541578564035
  24. Marco Olivares OrdonezSacramento, CA 958171578414033
  25. James Olivas, C.PED, C.F.O.Arroyo Grande, CA 934201245594688
  26. Dianna OliverCamarillo, CA 930121609925577
  27. Meryl OliverLos Gatos, CA 950321083457378
  28. Richard Oliver, M.D.Pleasanton, CA 945881669415527
  29. Rhoda Olkin, PH.D.Walnut Creek, CA 945981366509838
  30. Toivo OllilaSan Francisco, CA 941031073805842
  31. Eileen OlosanSan Luis Obispo, CA 934011730678160
  32. David Olsen, M.D.Sacramento, CA 958161316959315
  33. Jamie Olsen, OTD, OTR/LNorth Hollywood, CA 916061417200080
  34. Lisa Olsen, OTD, OTR/LIrvine, CA 926021437443728
  35. Edward Olsgard, MDEureka, CA 955031689617482
  36. Carmen Olson, B.A.Eureka, CA 955031245366533
  37. David Olson, CASColoma, CA 956131982737417
  38. Theodore Olson, M.D.Santa Rosa, CA 954051417041591
  39. Carl Omstead, PA-CConcord, CA 945201982661427
  40. Allison Ong, M.S., OTR/LPalo Alto, CA 943041700054434
  41. Audrey Ong, M.D.Santa Ana, CA 927071033144365
  42. James Ong, M.D.Tarzana, CA 913561912955980
  43. Richard Ong, M.D.Santa Ana, CA 927071881629251
  44. Diana OntiverosSan Francisco, CA 941031427206853
  45. Edward Onuma, M.D.,PHDSan Mateo, CA 944011477559722
  46. Ira Opatowsky, MDLancaster, CA 935341659374445
  47. Andrew Ordon, M.D.Rancho Mirage, CA 922701033143086
  48. Shannon Ordon, MDLos Angeles, CA 900241881125755
  49. Dina OrellanaOakland, CA 946121578175469
  50. David Orias, M.D.Santa Barbara, CA 931051245272533

Source: CMS NPPES, primary taxonomy 174400000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 19 of 51 per resident

  1. Massachusetts16
  2. West Virginia15
  3. Maryland15
  4. California15
  5. Minnesota15
  6. Delaware13
  7. 50 states and D.C.18

Source: CMS NPPES, primary taxonomy 174400000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

29.6% of these records appear in a Medicare file, against 17.0% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. California29.6%
  2. United States17.0%

Specialist records in California, measured

  • In a Medicare file1,704 of 5,749 · 29.6% here, 17.0% nationally
  • In the CMS Doctors and Clinicians file1,076 · 18.7% here, 11.1% nationally
  • Not updated in five years or more4,403 · 76.6% here, 77.3% nationally
  • Median graduation year1989 · the 1,075 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 174400000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

5,749 NPPES records list specialist (174400000X) as their primary taxonomy with a practice address in California: 15 per 100,000 residents against 18 nationally (50 states and D.C.). San Francisco has 666 of them (12%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. Florida2,685
  2. Washington2,609
  3. Pennsylvania2,031
  4. Texas1,716

States with a similar rate per 100,000

  1. Minnesota14.6
  2. Maryland15.2
  3. West Virginia15.4
  4. Massachusetts15.7

The largest states

  1. New York22,636
  2. Florida2,685
  3. Washington2,609
  4. Pennsylvania2,031
  5. Texas1,716

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

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.