NPPES file of Aug 9, 2026

Rheumatology Physician in California

926 NPPES records list rheumatology physician with a practice address in California, 2.4 per 100,000 residents, the 20th 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 11 of 19.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207RR0500X · 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, 93

  1. Los Angeles93
  2. San Francisco64
  3. San Diego42
  4. Sacramento27
  5. Stanford25

Rheumatology Physician records in California

  1. John Loeb, M.D.Walnut Creek, CA 945981932106390
  2. James Louie, MDLos Angeles, CA 900951174542088
  3. Michael Lovy, M.D.Palm Springs, CA 922621518026483
  4. Spencer Lowe, M.D.Burlingame, CA 940101134213572
  5. Helen Lu, MDBaldwin Park, CA 917061750458691
  6. Thuthiri Lwin, M.D.Chula Vista, CA 919101174010896
  7. Megan Lynch, D.O.San Diego, CA 921301316213705
  8. Michael Lyon, M.D.Livermore, CA 945501255357968
  9. Arthur Mabaquiao, M.D.San Diego, CA 921081730271933
  10. Catherine Mac Lean, MDLos Angeles, CA 900951124047055
  11. Natalie Maclean, MD, MSC, FRCPCEncinitas, CA 920241316429244
  12. Judy Maddox, DOWest Hollywood, CA 900481235349671
  13. Michael Maehara, M.D.Long Beach, CA 908151316969629
  14. Molly Magnano, MDBerkeley, CA 947051992743579
  15. Rajinder Mahajan, MDHarbor City, CA 907101962550913
  16. Tandis Mahani, MDWhittier, CA 906031245818178
  17. Suresh Maharjan, MDSanta Clara, CA 950511194189704
  18. Ana Maheshwari, MDFountain Valley, CA 927081306259130
  19. Farah Mahmood, M.D.Modesto, CA 953551134385974
  20. Azadeh Majlessi, M.D.Huntington Beach, CA 926481871533679
  21. Tony Makhlouf, MDSimi Valley, CA 930651992932214
  22. Raymond Malamet, MDSan Francisco, CA 941161760488415
  23. James Malinak, M.D.La Mesa, CA 919411497867501
  24. Arundathi Malladi, M.D.Larkspur, CA 949391073709416
  25. Michael Manansala, MDBerkeley, CA 947051841665411
  26. Jennifer Mandal, M.D.San Francisco, CA 941431174880405
  27. Dan Mandel, MDNewport Beach, CA 926631578672309
  28. Ernest Maningding, MD, MPHOakland, CA 946021831551274
  29. David Maniscalco, M.D.Santa Rosa, CA 954031386031268
  30. Mark Mansour, M.D.Cameron Park, CA 956821073597241
  31. Susan Mansourian, MDSanta Barbara, CA 931101538680707
  32. Poonam Manwani, M.D.Palo Alto, CA 943011609220839
  33. Diane Mar, MDStanford, CA 943051356704795
  34. Shelley Marder, M.D.San Francisco, CA 941151184648636
  35. Mary Margaretten, MDSan Francisco, CA 941431588802706
  36. Ginder Marshall, M.D.Inglewood, CA 903011669521076
  37. Joseph Martin, M.D.San Diego, CA 921341801862438
  38. William Martin, MDSanta Monica, CA 904041174632970
  39. Lauren Mathias, M.D.Downey, CA 902411912361072
  40. Kavitha Mattaparthi, M.D.Sacramento, CA 958231891182150
  41. Dean Mayer, M.D.La Mesa, CA 919421609886019
  42. Samuel McAlpine, M.D.Mather, CA 956551881673804
  43. Edward McGinn, M.D.Santa Barbara, CA 931101356454888
  44. Ian McLean, MBCHB PHD FACP FRCPSouth San Francisco, CA 940801306047378
  45. Maureen McMahon, MDLos Angeles, CA 900951285655852
  46. Melissa McNamara, MDSan Ramon, CA 945831477679793
  47. Swati Medhekar, MDAnaheim, CA 928071427125442
  48. Joseph Mehrabi, MDMission Hills, CA 913451942886379
  49. Amal Mehta, M.D.Hemet, CA 925431639374549
  50. Kristen MengwasserSan Francisco, CA 941101841828720

Source: CMS NPPES, primary taxonomy 207RR0500X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 20 of 51 per resident

  1. Missouri2.4
  2. Oregon2.4
  3. South Carolina2.4
  4. California2.4
  5. Nebraska2.3
  6. New Mexico2.3
  7. 50 states and D.C.2.4

Source: CMS NPPES, primary taxonomy 207RR0500X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

81.3% of these records appear in a Medicare file, against 81.6% 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. California81.3%
  2. United States81.6%

Rheumatology Physician records in California, measured

  • In a Medicare file753 of 926 · 81.3% here, 81.6% nationally
  • In the CMS Doctors and Clinicians file643 · 69.4% here, 69.5% nationally
  • Not updated in five years or more571 · 61.7% here, 56.6% nationally
  • Median graduation year2003 · the 641 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207RR0500X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

926 NPPES records list rheumatology physician (207RR0500X) as their primary taxonomy with a practice address in California: 2.4 per 100,000 residents against 2.4 nationally (50 states and D.C.). Los Angeles has 93 of them (10%).

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 York599
  2. Texas545
  3. Florida494
  4. Pennsylvania413

States with a similar rate per 100,000

  1. South Carolina2.4
  2. Oregon2.4
  3. Nebraska2.3
  4. New Mexico2.3

The largest states

  1. New York599
  2. Texas545
  3. Florida494
  4. Pennsylvania413
  5. Massachusetts343

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.