NPPES file of Aug 9, 2026

Infectious Disease Physician in California

1,119 NPPES records list infectious disease physician with a practice address in California, 2.9 per 100,000 residents, the 25th 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 15 of 23.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207RI0200X · 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, 147

  1. Los Angeles147
  2. San Francisco108
  3. San Diego76
  4. Stanford58
  5. Sacramento56

Infectious Disease Physician records in California

  1. Aran Nichol, MDSanta Cruz, CA 950621154477768
  2. Harry Nickle, M.D.Lancaster, CA 935341144356460
  3. Paul Nieberg, MDPasadena, CA 911061902909187
  4. John Nienow, MDSan Francisco, CA 941151861472649
  5. Jagraj Nijjar, M.D.Yuba City, CA 959911689610990
  6. Ajani Nimmagadda, M.D.Tarzana, CA 913561801949714
  7. Suzanne Noble, MDSan Francisco, CA 941431104871219
  8. Jim Nomura, MDLos Angeles, CA 900271912074808
  9. Behzad Noorian, MDTorrance, CA 905051467536128
  10. Jesse Nussbaum, M.D.San Francisco, CA 941431841312865
  11. Joseph Nussbaum, MDWestlake Village, CA 913611922033463
  12. Christopher O'Brien, MDSan Diego, CA 921201730250788
  13. Loretta Obrien, MDLivermore, CA 945501750379657
  14. Jillian Oft, MDLos Angeles, CA 900481184940876
  15. Ye OoPomona, CA 917671972975241
  16. Zin Oo, M.D.Los Angles, CA 900221265744999
  17. Almira Opardija, MDFresno, CA 937011982901294
  18. John Openshaw, MDPalo Alto, CA 943051679720460
  19. Steven Oppenheimer, MDCastro Valley, CA 945461962435396
  20. Manuel Orellana, MDStockton, CA 952041609811868
  21. Gabriel Ortiz, MD, PHDSan Francisco, CA 941101831391879
  22. Henry Oster, M.D.Ventura, CA 930031417992223
  23. Lily Ostrer, MDSan Diego, CA 920931821592155
  24. Babatunde Otulana, M.D.Sacramento, CA 958171306823166
  25. Theodore Pak, MD, PHDOrange, CA 928681013476100
  26. Joel Palefsky, MDSan Francisco, CA 941151336191345
  27. Rachana Palnitkar, M.D.Los Gatos, CA 950321508050790
  28. Phillip Pang, MD, PHDStanford, CA 943051669709770
  29. Claire Panosian, MDLos Angeles, CA 900951114947892
  30. Manuel Pardo, MDLos Angeles, CA 900691366699423
  31. Connie Park, MDSan Leandro, CA 945771689816621
  32. Daniel Park, MD,MPHSan Diego, CA 921031538371844
  33. Steven Park, MDOrange, CA 928681033144928
  34. Sun Park, M.D.Los Angeles, CA 900331124177829
  35. Stephen Parodi, MDVallejo, CA 945891548348378
  36. Julie Parsonnet, M.D.Stanford, CA 943051083771646
  37. Shirisha Pasula, MDFresno, CA 937011396191987
  38. Bijal Patel, M.D.Pleasanton, CA 945661396961777
  39. Devesh Patel, MDWest Covina, CA 917911407840697
  40. Jigar Patel, MDBakersfield, CA 933061427634922
  41. Keval Patel, M.D.Gilroy, CA 950201447291182
  42. Nilesh Patel, MDGlendora, CA 917401508858903
  43. Nishita Patel, MDPomona, CA 917661881691269
  44. Roma Patel, M.D.Santa Ana, CA 927051740523406
  45. Vallari Patel, M.D.Rancho Mirage, CA 922701659540599
  46. Simon Paul, MDFresno, CA 937011699883694
  47. Steven Pavkovic, MDPasadena, CA 911051205918422
  48. Catherine Pearson, MDOakland, CA 946061750791364
  49. Melicent Peck, M.D., PHDSan Francisco, CA 941431033388269
  50. Mehmet Pekerol, MDWest Hollywood, CA 900691619167087

Source: CMS NPPES, primary taxonomy 207RI0200X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 25 of 51 per resident

  1. Vermont2.9
  2. Hawaii2.9
  3. Wisconsin2.9
  4. California2.9
  5. Louisiana2.8
  6. Virginia2.8
  7. 50 states and D.C.3.2

Source: CMS NPPES, primary taxonomy 207RI0200X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

78.6% of these records appear in a Medicare file, against 79.0% 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. California78.6%
  2. United States79.0%

Infectious Disease Physician records in California, measured

  • In a Medicare file880 of 1,119 · 78.6% here, 79.0% nationally
  • In the CMS Doctors and Clinicians file735 · 65.7% here, 68.4% nationally
  • Not updated in five years or more657 · 58.7% here, 56.5% nationally
  • Median graduation year2003 · the 735 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207RI0200X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

1,119 NPPES records list infectious disease physician (207RI0200X) as their primary taxonomy with a practice address in California: 2.9 per 100,000 residents against 3.2 nationally (50 states and D.C.). Los Angeles has 147 of them (13%).

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 York970
  2. Florida760
  3. Texas674
  4. Pennsylvania545

States with a similar rate per 100,000

  1. Wisconsin2.9
  2. Hawaii2.9
  3. Vermont2.9
  4. Louisiana2.8

The largest states

  1. New York970
  2. Florida760
  3. Texas674
  4. Pennsylvania545
  5. Massachusetts487

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.