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 23 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. Ramee Younes, M.D.Encino, CA 914361417337452
  2. Michelle Yousefzadeh, DOSanta Monica, CA 904041063033736
  3. Babak Youssefi, MDFresno, CA 937011326328949
  4. Chibong Alex Yu, D.O., M.P.H.Alhambra, CA 918011043573694
  5. Derrick Yu, DOTarzana, CA 913561427502541
  6. Hon Yu, MDSanta Ana, CA 927041023118486
  7. Kalvin Yu, MDLos Angeles, CA 900341154498038
  8. Steven Yukl, MDSan Francisco, CA 941211023269966
  9. Rachel Zabner Spielberger, M.D.Los Angeles, CA 900481033149703
  10. Phillip Zakowski, M.D.Los Angeles, CA 900481205861580
  11. Andrea Zambrano, MDSanta Barbara, CA 931051992066336
  12. Danniel Zamora, M.D.Irvine, CA 926181326468158
  13. David Zamora Diaz, MDLos Angeles, CA 900951396448577
  14. James Ziegenbein, M.D. A PROF CORPDowney, CA 902401447278072
  15. Robert Zimmerman, M.D.Sacramento, CA 958161619294352
  16. Alex Zimmet, MDStanford, CA 943051134650575
  17. Tracy Zivin-Tutela, MDFountain Valley, CA 927081841230646
  18. Andrew Zolopa, M.D.Stanford, CA 943051447264130
  19. Rustin Zomorodi, MD, MPHLos Angeles, CA 900331265995682

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.