NPPES file of Aug 9, 2026

Emergency Medicine Physician in California

7,751 NPPES records list emergency medicine physician with a practice address in California, 20 per 100,000 residents, the 28th 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 105 of 156.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207P00000X · 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, 632

  1. Los Angeles632
  2. San Diego496
  3. Sacramento369
  4. San Francisco289
  5. Oakland247

Emergency Medicine Physician records in California

  1. Talib Omer, M.D., PH.D.Los Angeles, CA 900331396039822
  2. So Onishi, MDSan Diego, CA 921201699192575
  3. Jorge Ontiveros-Ramirez, MDOceanside, CA 920561881055853
  4. Victoria Oppenheim, MDOrange, CA 928681700345519
  5. Marianna Oppenheimer, MD, MSCWalnut Creek, CA 945961538657762
  6. Derek Orchard, D.O.Colton, CA 923241780965749
  7. Comfort Orebayo, DOLoma Linda, CA 923541861132185
  8. David Orenberg, MDFremont, CA 945381710017710
  9. Martin Orens, MDDowney, CA 902411356391544
  10. Martin Oretsky, M.D.Escondido, CA 920251720093180
  11. Daniel Orjuela, M.D.Santa Clara, CA 950511285869917
  12. Kseniya Orlik, MDHarbor City, CA 907101811262918
  13. Elmo Orlino, M.D.Alhambra, CA 918011427197813
  14. Michael Orlinsky, MDLos Angeles, CA 900331508935537
  15. Matea Orlovic, DOSan Diego, CA 921201194222745
  16. Francisco Ornelas, M.D.Chino, CA 917101235196718
  17. Carolina Ornelas-Dorian, MD, MPHSan Francisco, CA 941431861070351
  18. John Orona, M.D.Fresno, CA 937211528110160
  19. Daniel Orosco, D.O.Oxnard, CA 930301922485671
  20. Louis Orosz, M.D.Chula Vista, CA 919101194727024
  21. Jose OrozcoSelma, CA 936621245799550
  22. Nicholas OrozcoLos Angeles, CA 900331477915528
  23. Lance Orr, MDSouth Lake Tahoe, CA 961501548230790
  24. Elvia Orrillo, M.D.Riverside, CA 925031639114259
  25. Alexandra Ortega, D.O.San Leandro, CA 945771710332655
  26. Briana Ortega, MDFresno, CA 937201952044935
  27. Joanna Ortega, MD, MPHSan Francisco, CA 941431811504533
  28. Jeremy Orvik, MDOakland, CA 946061972628477
  29. Robert Orynich, MDVallejo, CA 945891255838652
  30. Patrick Osak, DOLoma Linda, CA 923541154827814
  31. Megan Osborn, M.D.Orange, CA 928681285810689
  32. John Osborne, M.DRiverside, CA 925011912013194
  33. Nolito Osea, M.D.Madera, CA 936371770698136
  34. Alan Osgood, MDAnaheim, CA 928041043277452
  35. Jonathan Osgood, D.O.Torrance, CA 905021609137892
  36. Sachie Oshima, MDStanford, CA 943051700809100
  37. Masaru Oshita, M.D.Sacramento, CA 958171205035029
  38. Takahi Oshita, MDInglewood, CA 903011154340248
  39. Erin Osiecki, MDGrass Valley, CA 959451336499789
  40. Daria Osipchuk, MDLos Angeles, CA 900331619531381
  41. Natalia OsipchukSan Francisco, CA 941431326674102
  42. Seth Oskie, MDTorrance, CA 905021194903450
  43. Scott Oslund, MDModesto, CA 953551902913858
  44. Mohamednoor Osman, MDStockton, CA 952041972517175
  45. Jessica Osterman, MDLos Angeles, CA 900171881842011
  46. Brian Ostick, M.D.Calabasas, CA 913021457527756
  47. Herald Ostovar, M.D.Rancho Mirage, CA 922701780662023
  48. Ronald Ostrom, D.O.Tulare, CA 932741730169855
  49. Joanna Osuga, MDSacramento, CA 958251750453577
  50. Andrew Osugi, M.D.Berkeley, CA 947051134307382

Source: CMS NPPES, primary taxonomy 207P00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 28 of 51 per resident

  1. Montana21
  2. Arizona20
  3. Kentucky20
  4. California20
  5. Virginia20
  6. North Carolina19
  7. 50 states and D.C.21

Source: CMS NPPES, primary taxonomy 207P00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

80.9% of these records appear in a Medicare file, against 81.5% 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. California80.9%
  2. United States81.5%

Emergency Medicine Physician records in California, measured

  • In a Medicare file6,272 of 7,751 · 80.9% here, 81.5% nationally
  • In the CMS Doctors and Clinicians file4,561 · 58.8% here, 58.7% nationally
  • Not updated in five years or more4,610 · 59.5% here, 54.8% nationally
  • Median graduation year2011 · the 4,560 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207P00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

7,751 NPPES records list emergency medicine physician (207P00000X) as their primary taxonomy with a practice address in California: 20 per 100,000 residents against 21 nationally (50 states and D.C.). Los Angeles has 632 of them (8%).

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 York5,025
  2. Texas4,885
  3. Florida4,034
  4. Pennsylvania3,911

States with a similar rate per 100,000

  1. Virginia19.8
  2. Kentucky20.0
  3. Arizona20.1
  4. North Carolina19.3

The largest states

  1. New York5,025
  2. Texas4,885
  3. Florida4,034
  4. Pennsylvania3,911
  5. Illinois3,291

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.