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 13 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 Norris, M.D.San Luis Obispo, CA 934091801083076
  2. Johannes Nowatzky, M.D.Palo Alto, CA 943041780813543
  3. Courtney O'Brien, DOSimi Valley, CA 930651609396514
  4. Derek Ochi, DOSacramento, CA 958171194352146
  5. Brian Oconnor, MDPasadena, CA 911051770641870
  6. David Oh, M.D.Torrance, CA 905031366549255
  7. Jenny Oh, M.D.Tarzana, CA 913561386657856
  8. Thomas Okarma, PH.D., M.D.Menlo Park, CA 940251972761492
  9. Chetachi Okereke, M.D, M.B.B.SWalnut Creek, CA 945961083842199
  10. Johnson Ong, DOLoma Linda, CA 923541568045508
  11. Steven Orkand, MDCarmichael, CA 956081922186600
  12. Anthony Padula, M.D.San Francisco, CA 941081235103813
  13. Hui Pan, MDVallejo, CA 945891477631042
  14. Gharoon Panahi, MDFountain Valley, CA 927081912956053
  15. Shirley Pang, M.D.Fullerton, CA 928351457437626
  16. Winnie Pang, M.D.Monterey Park, CA 917541962734798
  17. Richard Panush, M.D.Los Angeles, CA 900331164458188
  18. Gerlie Papillion, MDGilroy, CA 950201598740953
  19. Vidya Parameswaran, M.D.Campbell, CA 950081518078179
  20. Meghal Parikh, MDMerced, CA 953401922115856
  21. Christine Park, MDLaguna Beach, CA 926511003963364
  22. Noune Pashinian, MDGlendale, CA 912031952460859
  23. Neelakshi Patel, M.D.Campbell, CA 950081508956475
  24. Nikita Patel, M.D.San Luis Obispo, CA 934031932511904
  25. Puja PatelSan Diego, CA 921031689162414
  26. Roshan Patel, M.D.Covina, CA 917221457709131
  27. Shivani Patel, M.D.Fullerton, CA 928351487946364
  28. Sarah PattersonSan Francisco, CA 941431346531175
  29. Christina Payne, M.D.La Jolla, CA 920371679912661
  30. Mahmood Pazirandeh, MD, FACP, FACRSan Diego, CA 921081134109390
  31. Alexander Peck, DOLos Angeles, CA 900451588197545
  32. Brian Pedersen, M.B.B.S.La Jolla, CA 920931790913770
  33. Jacob Pelta, MDLos Angeles, CA 900481477664217
  34. Gary Peltz, M.D.San Francisco, CA 941431962595769
  35. Sravani PenumartyLos Angeles, CA 900951801273461
  36. Wendy Perdomo Pena, M.D.Mountain View, CA 940401659934412
  37. Jay Persselin, M.D.Los Angeles, CA 900731952325268
  38. Alan Peter, M.D.Ventura, CA 930031881690089
  39. Timothy Peters, M.D.Redding, CA 960011417909847
  40. Rachel Peterson, MDChula Vista, CA 919111447615588
  41. Alfred PetrocelliSanta Cruz, CA 950621588644025
  42. Long Pham, M.D.Beverly Hills, CA 902111215317821
  43. Andrew Phan, M.D.Orange, CA 928691710164736
  44. Jaya Philipose, M.D.Mission Viejo, CA 926911477671386
  45. Dawn Piarulli, M.D.Los Angeles, CA 900891376864793
  46. Donald Pierce, MDNovato, CA 949451043394018
  47. Lilit Pilossyan, MDFontana, CA 923351356753602
  48. Ken Pischel, M.D., PH.D.La Jolla, CA 920371124082847
  49. Olga Popel, MDWestlake Village, CA 913611265518054
  50. Jana Posalski, M.D.West Hollywood, CA 900481023230893

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.