NPPES file of Aug 9, 2026

Internal Medicine Physician in California

17,696 NPPES records list internal medicine physician with a practice address in California, 45 per 100,000 residents, the 17th highest rate of 51. Los Angeles and San Francisco have the most; each record links to the provider's NPI and the California license search. Page 229 of 354.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207R00000X · 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, 1,423

  1. Los Angeles1,423
  2. San Francisco1,318
  3. San Diego961
  4. Sacramento601
  5. Oakland432

Internal Medicine Physician records in California

  1. Valerie Novak, M.D.Carlsbad, CA 920111881769578
  2. Janette Noveras, M.D.San Diego, CA 921341043669666
  3. Elham Novin Baheran, MDSanta Maria, CA 934541245432897
  4. Maya Noyman-Fain, M.D.Novato, CA 949451174793509
  5. Gifty-Maria Ntim, M.D.Palmdale, CA 935501083894083
  6. Dayani Nualles-Percy, M.D.San Jose, CA 951281679815831
  7. Erik Nuckols, MDLos Angeles, CA 900271255408134
  8. Teryl Nuckols, MDLos Angeles, CA 900951184646622
  9. Gary Nudell, MDWest Hills, CA 913071881617736
  10. Kenneth Nudelman, MDLos Angeles, CA 900341336208925
  11. Lynn Nugent, M.D.Irvine, CA 926181750533253
  12. Savitha Nukal, MDSan Luis Obispo, CA 934011184664237
  13. Aswin Nukala, M.D.Porter Ranch, CA 913261093155350
  14. Daniel Null, MDSan Francisco, CA 941151689638744
  15. Shantanu Nundy, M.D.Stanford, CA 943051891950606
  16. Nadia Nunes Cavalcante Parr, M.D.Encinitas, CA 920241821524620
  17. Vanessa Nunez, MD MBAStanford, CA 943051134826175
  18. Marsha Nunley, MDOakland, CA 946121427078955
  19. Khalid Nur, M.D.Pico Rivera, CA 906601235147521
  20. Vlad Nusinovich, M.D.West Hollywood, CA 900461144288036
  21. Robert Nussbaum, M.D.San Francisco, CA 941431437183092
  22. Rhoda Nutik, MDRedwood City, CA 940631235217829
  23. Nicolas Nuttall, M.D.Monterey, CA 939401841388279
  24. Fabian Nwadei, MDFresno, CA 937211457348310
  25. Joseph Nwadiuko, MD MPHSanta Monica, CA 904041568849172
  26. Maureen Nwaokoro, DOMoreno Valley, CA 925551497215230
  27. Nnenna Nwogu, M.D.Emeryville, CA 946081255711461
  28. Chizoba Nwosu, M.D.San Leandro, CA 945771912935909
  29. Sandra Nwosu, MDSan Diego, CA 921231285213868
  30. Samuel Nyamu, M.D.Mission Hills, CA 913451023268869
  31. May Nyein, MDDowney, CA 902421083740633
  32. Chinyere Nyenke, M.D.Los Angeles, CA 900181992759534
  33. Kenneth Nyman, M.D.Tarzana, CA 913561093804304
  34. Iwan Nyotowidjojo, M.D.Rancho Santa Margarita, CA 926881578976270
  35. Rex Nzeribe, M.D.Oakhurst, CA 936441053322503
  36. James O'Brien, MDIrvine, CA 926041922188168
  37. Mark O'Brien, D.O.Vista, CA 920831497744247
  38. Meghan O'Brien, MD, MBESan Francisco, CA 941101245641539
  39. Rebecca O'Brien, MDFremont, CA 945381437223757
  40. Stephen O'Brien, M.D.Oakland, CA 946091699794453
  41. William O'Bryant, M.D.Cypress, CA 906301013041003
  42. W O'CallaghanSanta Barbara, CA 931051932294816
  43. Lisa O'Connell, M.D.La Mesa, CA 919421285849604
  44. Timothy O'Connell, MDRedondo Beach, CA 902771831155290
  45. Brian O'Connor, M.D., MPHWalnut Creek, CA 945951487087615
  46. John O'FeeLa Jolla, CA 920371578203956
  47. Tyler O'Flahrity, MDSacramento, CA 958171043637127
  48. Philip O'Keefe, MDSan Francisco, CA 941141013089762
  49. Nancy O'Malley, M.D.Arroyo Grande, CA 934201306030192
  50. Bruce O'Neil, M.D.Oakland, CA 946011255399580

Source: CMS NPPES, primary taxonomy 207R00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 17 of 51 per resident

  1. New Jersey50
  2. New Hampshire48
  3. Minnesota46
  4. California45
  5. Florida45
  6. Ohio45
  7. 50 states and D.C.44

Source: CMS NPPES, primary taxonomy 207R00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

79.5% of these records appear in a Medicare file, against 78.7% 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. California79.5%
  2. United States78.7%

Internal Medicine Physician records in California, measured

  • In a Medicare file14,068 of 17,696 · 79.5% here, 78.7% nationally
  • In the CMS Doctors and Clinicians file11,077 · 62.6% here, 61.4% nationally
  • Not updated in five years or more10,832 · 61.2% here, 55.4% nationally
  • Median graduation year2004 · the 11,065 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207R00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

17,696 NPPES records list internal medicine physician (207R00000X) as their primary taxonomy with a practice address in California: 45 per 100,000 residents against 44 nationally (50 states and D.C.). Los Angeles has 1,423 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 York12,067
  2. Florida10,151
  3. Texas9,175
  4. Pennsylvania7,300

States with a similar rate per 100,000

  1. Minnesota45.9
  2. Ohio44.8
  3. New Hampshire48.0
  4. Maine42.8

The largest states

  1. New York12,067
  2. Florida10,151
  3. Texas9,175
  4. Pennsylvania7,300
  5. Illinois7,238

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.