In plain English
Allergy and immunology is one of the few fellowships open from two different residencies: internists and pediatricians both enter it, and many practices see adults and children in the same clinic. It has a classification of its own on the public record, which makes it easier to count exactly than most sub-specialties.
The work is clinic-based and test-heavy - skin and blood testing, immunotherapy schedules, and the long-term management of asthma and allergic conditions shared with primary care.
It is a small and unevenly distributed specialty. Many smaller markets have very few, and coverage is often provided across several satellite sites by a single practice, so practice-level data matters more here than headcount.
Training and credentials
An internal medicine or pediatrics residency, a two-year allergy and immunology fellowship, then board certification.
Where they practise
Office-based allergy practices with satellite sites, hospital and academic divisions, some pediatric groups.
Allergists and immunologists on the public record
Counted from what providers file about themselves, with suppression applied before anything is counted, refreshed 2026-10-05. Names, specialties and practice locations are public; work email and phone are for signed-in customers.
| State | On record | With work email | With practice phone |
|---|---|---|---|
| California | 855 | 579 68% | 855 |
| Texas | 656 | 398 61% | 656 |
| New York | 604 | 397 66% | 604 |
| Florida | 460 | 250 54% | 460 |
| Pennsylvania | 320 | 212 66% | 320 |
| Illinois | 301 | 196 65% | 301 |
| New Jersey | 271 | 164 61% | 271 |
| Michigan | 263 | 164 62% | 263 |
Closely related, and where to find them.
Closely related
- Pulmonologist Lung medicine, usually combined with critical care - so usually a hospital specialty.
- Pediatrician The generalist specialty defined by age rather than by organ system.
- Internal medicine physician Adult general medicine, and the classification most sub-specialties are filed beneath.
Find them
- Allergists and immunologists list counts by state, the fields a record carries, a sample record.
- Physicians physician data by specialty, state and employer.
Need the list, not the definition?
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