NPPES file of Aug 9, 2026

Allergy & Immunology Physician in California

444 NPPES records list allergy & immunology physician with a practice address in California, 1.1 per 100,000 residents, the 21st highest rate of 51. San Diego and Los Angeles have the most; each record links to the provider's NPI and the California license search. Page 6 of 9.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207K00000X · method

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

San Diego has the most, 48

  1. San Diego48
  2. Los Angeles34
  3. San Francisco15
  4. Walnut Creek14
  5. Palo Alto13

Allergy & Immunology Physician records in California

  1. Jonathan Lyons, M.DSan Diego, CA 921031588860076
  2. Mohsen Mabudian, M.D.Redlands, CA 923731629022819
  3. Gil Magpantay, MDDavis, CA 956161619173275
  4. Karim Mahdavie, MDSimi Valley, CA 930651568456911
  5. Massoud Mahmoudi, D.O.Los Gatos, CA 950321255402640
  6. Sultan Majid, DORancho Mirage, CA 922701366902454
  7. Edwin Malesky, MDRedlands, CA 923731326156209
  8. Binita Mandal, MDCarmichael, CA 956081649222787
  9. Ripdeep Mangat, M.D.Newport Beach, CA 926631518069590
  10. Krikor Manoukian, M.D.Burbank, CA 915051740519586
  11. Louis Marchioli, M.D.La Mirada, CA 906381164414603
  12. Joseph Marino, M.D.Fair Oaks, CA 956281760500797
  13. Jamila Martin, M.D.Mountain View, CA 940401316164106
  14. Michael Martin, MDSanta Rosa, CA 954051245213776
  15. Matthew McCulloch, M.D.San Francisco, CA 941431326401019
  16. Arthur McLean, MDSan Luis Obispo, CA 934011639106727
  17. Stephanie Measures, MDSan Diego, CA 921231003074469
  18. Anjuli Mehrotra, MDPalo Alto, CA 943041629187984
  19. Vinay Mehta, M.D.Laguna Niguel, CA 926771225106255
  20. Steven Meltzer, MDLong Beach, CA 908081316915135
  21. Guillermo Mendoza, MDVacaville, CA 956881306998521
  22. Rajan Merchant, M.D.Woodland, CA 956951396773552
  23. Etan Milgrom, MDLos Angeles, CA 900891649281130
  24. Michael Miller, MDAntioch, CA 945091437201662
  25. Andrea Miller-Lari, D.OOroville, CA 959661952761843
  26. Stuart Min, MDAlhambra, CA 918011285952358
  27. Ranjeet Minocha, M.D.Rancho Mirage, CA 922701407103492
  28. Dayna Miyashiro, MDVista, CA 920831699158493
  29. Brian Modena, M.D., MSCLa Jolla, CA 920371235379207
  30. Fatema Mollah, MDSacramento, CA 958171346803269
  31. Alfred Moon, M.D.Yorba Linda, CA 928861396953105
  32. Daniel More, M.D.San Luis Obispo, CA 934011306844279
  33. Ronald Moss, MDEncinitas, CA 920241801048079
  34. Nancy Mozelsio, MDWalnut Creek, CA 945981114910551
  35. Asal Naderi, MDLos Angeles, CA 900331275859027
  36. David Naimi, DOCamp Pendleton, CA 920551215145289
  37. Jennifer Namazy, M.D.San Diego, CA 921081831160019
  38. Teresa Neeno, MDSacramento, CA 958191366553273
  39. Katharine Nelson, MDSan Jose, CA 951281497921811
  40. Bichphuong Nguyen, MDSanta Clara, CA 950511962589820
  41. Cindy Nguyen, D.O.Mountain View, CA 940401558893297
  42. Diem-Tran Nguyen, MDOrange, CA 928681215498761
  43. Jenna Nguyen, MDMenlo Park, CA 940251437492147
  44. Myngoc Nguyen, MDBerkeley, CA 947051194803965
  45. Thuong Nguyen, M.D.Visalia, CA 932911831196294
  46. James Nickelsen, M.D.Berkeley, CA 947051891772000
  47. Richard O'Connor, M.D.San Diego, CA 921011205848454
  48. Ashika Odhav, MDSan Diego, CA 921311427390855
  49. Jacob Offenberger, MDGranada Hills, CA 913441033121249
  50. Frank Orson, M.D.Lafayette, CA 945491982626131

Source: CMS NPPES, primary taxonomy 207K00000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 21 of 51 per resident

  1. Hawaii1.2
  2. Arizona1.2
  3. Washington1.2
  4. California1.1
  5. Ohio1.1
  6. Rhode Island1.1
  7. 50 states and D.C.1.2

Source: CMS NPPES, primary taxonomy 207K00000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

79.1% of these records appear in a Medicare file, against 80.0% 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. California79.1%
  2. United States80.0%

Allergy & Immunology Physician records in California, measured

  • In a Medicare file351 of 444 · 79.1% here, 80.0% nationally
  • In the CMS Doctors and Clinicians file281 · 63.3% here, 65.7% nationally
  • Not updated in five years or more276 · 62.2% here, 57.3% nationally
  • Median graduation year2004 · the 281 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207K00000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

444 NPPES records list allergy & immunology physician (207K00000X) as their primary taxonomy with a practice address in California: 1.1 per 100,000 residents against 1.2 nationally (50 states and D.C.). San Diego has 48 of them (11%).

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. Texas327
  2. New York311
  3. Florida204
  4. Pennsylvania183

States with a similar rate per 100,000

  1. Washington1.2
  2. Ohio1.1
  3. Rhode Island1.1
  4. Arizona1.2

The largest states

  1. Texas327
  2. New York311
  3. Florida204
  4. Pennsylvania183
  5. Illinois162

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.