The federal NPI Registry lists 715 individual clinicians in California with allergy and immunology as their primary specialty, plus 268 organizations. That ranks California 1st among the 50 states and DC by listed clinicians.
Cities with the most listed clinicians
| City | Clinicians listed |
|---|---|
| San Diego | 64 |
| Los Angeles | 60 |
| San Francisco | 35 |
| Sacramento | 23 |
| San Jose | 21 |
| Palo Alto | 21 |
| Fresno | 18 |
| Walnut Creek | 18 |
| Santa Monica | 15 |
| Orange | 14 |
Specialty mix
| Primary taxonomy | Clinicians |
|---|---|
| Allergy & Immunology | 454 |
| Allergy & Immunology, Allergy | 158 |
| Internal Medicine, Allergy & Immunology | 82 |
| Pediatrics, Pediatric Allergy/Immunology | 13 |
| Allergy & Immunology, Clinical & Laboratory Immunology | 8 |
This pull searched the registry's Allergy & Immunology taxonomy. Pediatric subspecialists are registered under separate pediatric taxonomies, so the pediatric rows here undercount them.
Organizations listed on Immunologists.com
4 of the 268 allergy and immunology organizations in the California registry count have a profile on Immunologists.com so far. The rest don't have a listing here yet, and a profile is not an endorsement.
- Jeffrey J. Guttas. MD, INC.
- Allergy Medical Group Of The North Area INC.
- Desert Medical Group-Desert Specialty Group
- Joseph Medical Group INC.
For practice owners
Planning a sale, a partner buy-in or a new hire in California? Run the numbers with the practice calculators, or text Richard at (808) 600-9260 about growth capital.
Sources
- NPPES NPI Registry (Centers for Medicare and Medicaid Services), primary taxonomy counts by practice location state
- Counts come from a November 2026 pull of the NPPES NPI Registry API, filtered to records whose primary taxonomy is allergy and immunology and grouped by practice location address. Individual clinicians are NPI-1 records and organizations are NPI-2 records.
Immunologists.com is a business directory and education site. It does not give medical advice, rank or rate care, or refer patients. Listings come from public registry data and are not endorsements.
