NPPES file of Aug 9, 2026

Allergy & Immunology (Internal Medicine) Physician in California

81 NPPES records list allergy & immunology (internal medicine) physician with a practice address in California, 0.2 per 100,000 residents, the 11th highest rate of 47. San Francisco and Los Angeles have the most; each record links to the provider's NPI and the California license search. Page 1 of 2.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207RA0201X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

San Francisco has the most, 12

  1. San Francisco12
  2. Los Angeles8
  3. Sacramento4
  4. San Diego4
  5. Davis3

Allergy & Immunology (Internal Medicine) Physician records in California

  1. Shields Abernathy, M.D.Templeton, CA 934651508886235
  2. Sam Ahn, M.D.Napa, CA 945581558423814
  3. Fatima Ali, MDSacramento, CA 958171093045023
  4. Sowmya Arja, M.D.San Francisco, CA 941081215390166
  5. Anna Arroyo, MDStanford, CA 943051205102472
  6. Lawrence Awai, M.D.Clovis, CA 936191629510235
  7. Sally Bailey, MDSan Ramon, CA 945831700815677
  8. Tyler Basen, M.D.Mission Viejo, CA 926911184069692
  9. Sheila Bonilla-Tandoc, MD, MSLos Angeles, CA 900331457387805
  10. Geoffrey Carlson, MDTravis Afb, CA 945351174865588
  11. Suzanne Cassel, MDWest Hollywood, CA 900481316164015
  12. Meng Chen, MDStanford, CA 943051497190714
  13. Gang Cheng, MDModesto, CA 953551609038355
  14. Anna CherianSacramento, CA 958171215672738
  15. Rebecca Chinthrajah, M.D.Palo Alto, CA 943041225235120
  16. Chongwei CuiThousand Oaks, CA 913601922369008
  17. Linda Engelstad, MDOakland, CA 946021710997374
  18. Andrew Engler, MDSan Mateo, CA 944011366400384
  19. Clayton Feldman, M.D.San Jose, CA 951261548370521
  20. Christopher Foster, MDSan Diego, CA 921061588710644
  21. Warner Greene, M.D., PH.D.San Francisco, CA 941581528403797
  22. Frederick GuilfordLos Altos, CA 940221548345770
  23. Rosemary Hallett, M.D.Davis, CA 956161376527804
  24. Edward Hu, M.D.Los Angeles, CA 900331700045150
  25. Jonathan Jalali, MDPasadena, CA 911051548840929
  26. Imran Junaid, M.D.Concord, CA 945201285801787
  27. Jeremy Kaslow, M.D.Santa Ana, CA 927051144305574
  28. Ravdeep Kaur, M.D.Napa, CA 945581134567092
  29. Jay Keystone, M.D.Vacaville, CA 956881306115001
  30. William Klaustermeyer, MDLos Angeles, CA 900951265451165
  31. Anna LangSan Francisco, CA 941431235556432
  32. Joyce Lee, M.D.Los Angeles, CA 900951114243136
  33. Christine LicataSacramento, CA 958251437619533
  34. Brian Lipson, M.D.Rewood City, CA 940631821179391
  35. Michael Main, MDSan Francisco, CA 941141649833005
  36. Zahida Maskatia, M.D.San Mateo, CA 944011134364250
  37. Purvi Mehra, M.D.San Diego, CA 921031336280031
  38. Robert Meth, MDLos Angeles, CA 900671053387837
  39. Carlos Meza, M.D.Stockton, CA 952041730104761
  40. Christelle Miot, MDLoma Linda, CA 923541487150736
  41. Rose MonahanSan Francisco, CA 941431518461268
  42. Stephen Nagy, MDSacramento, CA 958191013929967
  43. Tejal NarsaiLong Beach, CA 908221326402330
  44. Andre Nel, MDLos Angeles, CA 900951023037702
  45. Bruce Nelson, M.D.Mission Viejo, CA 926911649269614
  46. Joseph Nguyen, MDOrange, CA 928681225217425
  47. Von Nguyen, MDSan Francisco, CA 941151174815815
  48. Osman Numair, MDSalinas, CA 939011073900106
  49. Iris Otani, M.D.San Francisco, CA 941431285925990
  50. Amit Patel, MDUpland, CA 917861396734547

Source: CMS NPPES, primary taxonomy 207RA0201X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 11 of 47 per resident

  1. Kansas0.3
  2. North Dakota0.3
  3. Connecticut0.2
  4. California0.2
  5. Colorado0.2
  6. Arkansas0.2
  7. 50 states and D.C.0.2

Source: CMS NPPES, primary taxonomy 207RA0201X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

66.7% of these records appear in a Medicare file, against 78.6% 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. California66.7%
  2. United States78.6%

Allergy & Immunology (Internal Medicine) Physician records in California, measured

  • In a Medicare file54 of 81 · 66.7% here, 78.6% nationally
  • In the CMS Doctors and Clinicians file46 · 56.8% here, 64.0% nationally
  • Not updated in five years or more40 · 49.4% here, 51.0% nationally
  • Median graduation year2010 · the 46 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207RA0201X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

81 NPPES records list allergy & immunology (internal medicine) physician (207RA0201X) as their primary taxonomy with a practice address in California: 0.2 per 100,000 residents against 0.2 nationally (50 states and D.C.). San Francisco has 12 of them (15%).

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 York61
  2. Texas50
  3. Maryland30
  4. Missouri28

States with a similar rate per 100,000

  1. Colorado0.2
  2. Virginia0.2
  3. Illinois0.2
  4. New Jersey0.2

The largest states

  1. New York61
  2. Texas50
  3. Maryland30
  4. Missouri28
  5. Florida25

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.