NPPES file of Aug 9, 2026

Anesthesiology Physician in California

7,571 NPPES records list anesthesiology physician with a practice address in California, 19 per 100,000 residents, the 18th highest rate of 51. Los Angeles and San Diego have the most; each record links to the provider's NPI and the California license search. Page 100 of 152.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207L00000X · method

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

Los Angeles has the most, 762

  1. Los Angeles762
  2. San Diego686
  3. San Francisco499
  4. Sacramento396
  5. Stanford387

Anesthesiology Physician records in California

  1. Norichika Okada, MDOrange, CA 928681568421832
  2. Vincent Okamoto, MDSan Diego, CA 921031952338709
  3. Tobechi Okoronkwo, M.D.Oakland, CA 946021013334143
  4. Emeka Okwuje, MDSan Diego, CA 921081154366987
  5. John Olea, M.D.Glendale, CA 912021982741898
  6. Alexandra Oleske, DOSan Diego, CA 921231053766444
  7. Muna Oli, MDSan Diego, CA 921231326676487
  8. Atalanta Olito, D.O.Murrieta, CA 925631245222363
  9. Ashley Oliver, M.D.Los Angeles, CA 900951760987390
  10. Jason Oliver, DOSanta Rosa, CA 954031700413671
  11. Andrea Olmos, M.D.San Francisco, CA 941431528314440
  12. Anna Michelle OlsenPalo Alto, CA 943041790119626
  13. Kevin Olson, M.D.San Diego, CA 921231053424101
  14. Moses Olson, M.D.San Bernardino, CA 924041518347434
  15. Robert Olson, M.D.Newport Beach, CA 926631538299094
  16. Robert Olson, MDOakland, CA 946111902984792
  17. Rosemary Omeeghan, MBCHBNewport Beach, CA 926631356381073
  18. Elnaz OmranLos Angeles, CA 900331124524715
  19. Bernard Ong, M.D.Pomona, CA 917671063456952
  20. Kwee Ong, M.D.Rancho Mirage, CA 922701497853949
  21. Lawrence Ong, M.D., M.ENG.Santa Ana, CA 927051316254840
  22. Shannon Ong, M.D.Oxnard, CA 930301649596537
  23. Yo-Hang Ong, MDSan Bernardino, CA 924041629018189
  24. Michael Ongele, MDStanford, CA 943051710447057
  25. Samantha Love Onnagan, M.D.Torrance, CA 905021245492016
  26. Eric Ontiveros, M.D.Orange, CA 928681477574986
  27. Thomas Onyia, M.DSan Diego, CA 921031902283443
  28. Amy Opfell, M.D.Newport Beach, CA 926631205810611
  29. Roy Opsahl, MDSonora, CA 953701902987522
  30. Chinedum Oranusi, MDLoma Linda, CA 923501346879376
  31. Ruth Oren, M.D.Lancaster, CA 935361821123696
  32. Alicja Orkiszewska, MDStockton, CA 952031528146099
  33. Elmo Orlino, M.D.Sacramento, CA 958171487627451
  34. Blanka Orloff, MDBurbank, CA 915051902086978
  35. Michael Orosco, MDSan Diego, CA 921201760596696
  36. Pedro Orozco, M.D.Orange, CA 928681902098858
  37. Cheryl Orr, M.D.South Lake Tahoe, CA 961501700806759
  38. Veronica Orr, MDStanford, CA 943051174986897
  39. Christopher Ortiz, M.D., PH.D.Los Angeles, CA 900951518283225
  40. Clemens Ortner, MDStanford, CA 943051174837785
  41. Dyan Osborne, DOModesto, CA 953551215020060
  42. Hayley OsenLos Angeles, CA 900171750812319
  43. Osahon Osifo, MDPalm Springs, CA 922621609946656
  44. Bijan Osmani, MDSacramento, CA 958211356760771
  45. Cheryl Osorio, M.D.Upland, CA 917861477584225
  46. Joseph Osterkamp, M.D.Sacramento, CA 958211710987631
  47. Philip OstermannThousand Oaks, CA 913601821235623
  48. Michael Ostrovsky, MDDaly City, CA 940151487605630
  49. Paul Osunwa, MDCorona, CA 928821255911673
  50. Lawrence Ota, MDCulver City, CA 902321043631617

Source: CMS NPPES, primary taxonomy 207L00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 18 of 51 per resident

  1. Montana20
  2. Arizona20
  3. Utah20
  4. California19
  5. Pennsylvania19
  6. Missouri19
  7. 50 states and D.C.18

Source: CMS NPPES, primary taxonomy 207L00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

71.3% of these records appear in a Medicare file, against 73.7% 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. California71.3%
  2. United States73.7%

Anesthesiology Physician records in California, measured

  • In a Medicare file5,396 of 7,571 · 71.3% here, 73.7% nationally
  • In the CMS Doctors and Clinicians file4,872 · 64.4% here, 67.2% nationally
  • Not updated in five years or more4,767 · 63.0% here, 57.8% nationally
  • Median graduation year2006 · the 4,868 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207L00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

7,571 NPPES records list anesthesiology physician (207L00000X) as their primary taxonomy with a practice address in California: 19 per 100,000 residents against 18 nationally (50 states and D.C.). Los Angeles has 762 of them (10%).

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. New York5,062
  2. Texas4,635
  3. Florida3,375
  4. Illinois2,575

States with a similar rate per 100,000

  1. Utah19.6
  2. Pennsylvania19.1
  3. Arizona19.8
  4. Montana20.0

The largest states

  1. New York5,062
  2. Texas4,635
  3. Florida3,375
  4. Illinois2,575
  5. Pennsylvania2,481

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.