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 267 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. Babak Rostami, M.D. INTERNAL MEDICILos Angeles, CA 900291811188048
  2. Benjamin Rostami, MDLos Angeles, CA 900291659830545
  3. Armand Rostamian, M.D.West Hollywood, CA 900481710265244
  4. Helen Rostamloo, MDGlendale, CA 912041285759514
  5. Michael Rotblatt, MDSylmar, CA 913421700894391
  6. Jeffrey Roth, D.O.Long Beach, CA 908061902868201
  7. Kenneth Roth, M.D.San Diego, CA 921231750475562
  8. Robert Roth, MDSan Diego, CA 921201790852713
  9. Vaal RothmanWatsonville, CA 950761386624609
  10. William Rothman, M.D.Belvedere, CA 949201518264548
  11. Aron Rotman, M.D.Valley Village, CA 916071508900887
  12. Barry Rotman, MDWalnut Creek, CA 945981528083599
  13. Sara Rotner, M.D.Oakland, CA 946111700112091
  14. Nareg Roubinian, M.D.San Francisco, CA 941181972631356
  15. Nicholas Roueiheb, D.O, MPHWoodland Hills, CA 913671598056236
  16. Wadi Rouel, M.D.San Diego, CA 921051740254713
  17. Steven Rouff, M.D.Van Nuys, CA 914051871645515
  18. Mehran Rouhani Sisan, M.D.La Habra, CA 906311841579489
  19. Neda Rouhi BrojeniTorrance, CA 905051225558919
  20. Hailey RoumimperScotts Valley, CA 950661871179556
  21. David Rousseau, MDSan Diego, CA 921061871565879
  22. Siamak Rouzroch, MDLong Beach, CA 908041730271685
  23. Giorgio Roveran, M.D.Redlands, CA 923731013155175
  24. Linda Row, MDWalnut Creek, CA 945961730251554
  25. Daniel Rowady, M.D.Pasadena, CA 911051578661609
  26. Jennifer Rowberry, MDRoseville, CA 956611689746331
  27. Beverly Rowe, PHYSICIAN ASSISTANTLos Angeles, CA 900181316168461
  28. Michael Rowe, M.D.San Quentin, CA 949641235158551
  29. Diana Rowell, M.D.Chula Vista, CA 919101932285004
  30. Terrie Rowen, MDOakland, CA 946111881772382
  31. Vincent RowleyOxnard, CA 930301346635190
  32. Leah Roxas, MDSacramento, CA 958251417009648
  33. Bakul Roy, M.D.San Ramon, CA 945831720056849
  34. Douglas Roy, M.D.Topanga, CA 902901417025180
  35. Ian Roy, M.D.Los Angeles, CA 900481073995320
  36. James Roy, MDCorona, CA 928791063511822
  37. Sion Roy, MDLos Angeles, CA 900661245499656
  38. Gregory Roybal, M.D.Los Angeles, CA 900221780734491
  39. Eric RoyzSan Diego, CA 921031821604612
  40. Irina Rozen, MDVallejo, CA 945891730267634
  41. Jacob Rozich, MDSan Diego, CA 921201316573363
  42. Qiao Nan RuanSan Francisco, CA 941091629655154
  43. Shivani Ruben, MDSacramento, CA 958161770928954
  44. Lisa Rubenstein, M.D.North Hills, CA 913431477656643
  45. Sally Rubenstone, MDPalo Alto, CA 943061235239740
  46. Juan Rubero, MDSacramento, CA 958211700916194
  47. Gregory Rubin, MDWoodland Hills, CA 913671275600298
  48. Haya Rubin, M.D.Palo Alto, CA 943011619058864
  49. Jack Rubin, M.D.Los Alamitos, CA 907201700882479
  50. Lewis Rubin, M.D.La Jolla, CA 920371457377780

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.