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 200 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. Dennis Matejka, MDBaldwin Park, CA 917061053482091
  2. Sandhya Matha, M.D.French Camp, CA 952311285016436
  3. Kabir Matharu, M.D.San Andreas, CA 952491396065215
  4. Rupinder Matharu, MDSanta Clara, CA 950511760569628
  5. Kristy Mathes, MDSacramento, CA 958171699033530
  6. Kiran Mathew, MDMorgan Hill, CA 950371659958759
  7. Lincy Mathew, M.D.Fremont, CA 945361225046261
  8. Manoj Mathew, M.D.Mission Hills, CA 913451962479816
  9. Rashmi Mathew, MDSanta Cruz, CA 950601093248254
  10. Sonia Mathew, MDSan Diego, CA 921731376284562
  11. Peter Mathews, MDNapa, CA 945581578641304
  12. Juliana Mathewson, M.D.Irvine, CA 926121275709594
  13. Herman Mathias, M.DHemet, CA 925431487767265
  14. Stan Mathioulakis, MDDuarte, CA 910101912080847
  15. Philip Mathis, M.D.Escondido, CA 920291942200399
  16. Anima Mathur, M.D.San Leandro, CA 945771508056805
  17. Arvind Mathur, MDHemet, CA 925431962726471
  18. Shaikh Matin, MDFresno, CA 937201962580852
  19. Hedieh Matinrad, M.D.San Francisco, CA 941101972035566
  20. Aniko Matis, MDBakersfield, CA 933041639244098
  21. Biserka Matkovic, MDBakersfield, CA 933011972674893
  22. Harlan Matles, M.D.Menlo Park, CA 940271164423604
  23. Mehrdad Matloubian, MDSan Francisco, CA 941431881658698
  24. Robert Matorin, M.D.Encinitas, CA 920241972525343
  25. Ryan Matson, M.D.San Rafael, CA 949031366718264
  26. Greg Matsubara, MDFresno, CA 937201659459568
  27. Kent Matsuda, M.D.Santa Rosa, CA 954051073531117
  28. Edeane Matsumoto, M.D.San Jose, CA 951281518069848
  29. Michael Matsumoto, MDSan Jose, CA 951191841376373
  30. Takeshi Matsumoto, M.D.Los Angeles, CA 900171104856186
  31. Lauren MatsunoReseda, CA 913351184374365
  32. Julie Matsuura, M.D.Huntington Beach, CA 926481861441917
  33. Kori MatsuuraFremont, CA 945381588050959
  34. Yara Matta, MDMurrieta, CA 925621073932133
  35. S. Anjani Mattai, MDLos Angeles, CA 900241528030996
  36. Michael Matthay, M.D.San Francisco, CA 941431891734497
  37. Sarah Matthews, DOMurrieta, CA 925631730760919
  38. Scott Matthews, MDPalo Alto, CA 943011467569327
  39. Jessica Matthiesen, MDTorrance, CA 905021700460508
  40. Catherine Matthys, M.D.Mission Hills, CA 913451104244656
  41. Crystal Mattimore, M.D.Topanga, CA 902901114943842
  42. Thomas Mattimore, MDLos Angeles, CA 900951447285507
  43. John Mattison, MDLos Angeles, CA 900271174671010
  44. Shawn Mattison, MDOakland, CA 946111972881340
  45. Edwin Mattson, MDAnaheim, CA 928011770580920
  46. Raman Mattu, M.D.Mendota, CA 936401609210830
  47. Michael Matus, M.D.Moreno Valley, CA 925551104116623
  48. William Matzner, M.D., PH.D.Simi Valley, CA 930651306905716
  49. Patrick Mauer, M. D.Los Angeles, CA 900171780755587
  50. Estefania Maurer SpakowskyDowney, CA 902421073910543

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.