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 104 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. David Oates, M.D.Santa Maria, CA 934541679504807
  2. Du-Sheer ObengLos Angeles, CA 900331841345626
  3. Enoch Obeng, MDStanford, CA 943051013442524
  4. Natalie Oberhauser-Lim, MDLoma Linda, CA 923541962081984
  5. David Obert, MDPalo Alto, CA 943041487268777
  6. Richard Obler, MDLa Jolla, CA 920371063475507
  7. Charles Obrien, MDHuntington Beach, CA 926461053357137
  8. Anthony Occhipinti, MDSacramento, CA 958251417035197
  9. Cesar Ochoa, MDFresno, CA 937201255637781
  10. Gabriel Ochoa, M.D.Mount Shasta, CA 960671952755167
  11. Humberto Ochoa, M.D.Moreno Valley, CA 925551770698862
  12. Melvin Ochs, M.D.Chula Vista, CA 919101598792442
  13. Charles Oconnell, M.D.San Diego, CA 921031316189723
  14. Targhee Oeveraas, MDSouth Lake Tahoe, CA 961501578792156
  15. Steven Offerman, MDSacramento, CA 958231780762401
  16. Ellen Offermann, MDSan Carlos, CA 940701811911431
  17. Ogechukwu Offorjebe, MDStanford, CA 943051942864780
  18. Peter Oftedahl, MDSacramento, CA 958251528146263
  19. Brentwood Oftedal, MDSacramento, CA 958171205459971
  20. Martin Ogle, M.DLaguna Hills, CA 926531407884505
  21. Adedamola Ogunniyi, M.D.Torrance, CA 905021518198423
  22. Bismark Oh, MDOceanside, CA 920561669524021
  23. Richard Oh, MDSanta Clara, CA 950511447324751
  24. Tony Ohn, M.D.Merced, CA 953401184676850
  25. Kent Okawa, M.D.Glendale, CA 912081316301450
  26. Okemefuna Okpara, M.D.Valencia, CA 913551205802428
  27. Sean Okumura, M.D.San Diego, CA 921031326486010
  28. Karen Olaes, M.D.Los Angeles, CA 900331023336963
  29. Bjork Olafsdottir-Gardali, M.D.Sacramento, CA 958171578959144
  30. Mark Olcott, MDLa Jolla, CA 920371669474417
  31. Caitlin OldenkampLos Angeles, CA 900951841751971
  32. George Oldham, M.DRedwood City, CA 940621336189182
  33. Sean Oldroyd, D.O.Visalia, CA 932911053743302
  34. Gary Olds, MDStockton, CA 952041194116459
  35. Bohdan Olesnicky, MDLa Quinta, CA 922531043254709
  36. Jerry Oliaro, DOFolsom, CA 956301457363889
  37. Amy Olin, M.D.San Luis Obispo, CA 934011831221480
  38. Marcus Olivares-Perez, MDFresno, CA 937211457937062
  39. David Oliver, MDTorrance, CA 905021316502016
  40. Donald Oliver, MDSacramento, CA 958251427136191
  41. Robert Oliver, MDSacramento, CA 958191427072172
  42. Cesar Olmedo, MDLoma Linda, CA 923541235499872
  43. Gregory Olsen, MDSanta Barbara, CA 931051598701658
  44. Linda Olsen, MDBellflower, CA 907061134267826
  45. Michael OlsgaardPalm Springs, CA 922621003313453
  46. Kellie OlsonLoma Linda, CA 923541346281946
  47. Kent Olson, MDSan Francisco, CA 941431275524696
  48. Marin OlsonSan Francisco, CA 941431407433782
  49. Prasra Olson, M.D.Los Angeles, CA 900271336400688
  50. Jennifer Ann Oman, MDOrange, CA 928681730269978

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.