Allergy & Immunology Physician: how many are there, and how many are in private practice?

National totals

What this specialty covers

An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.

Reading the sole-proprietor share

For this specialty, the sole-proprietor share describes the portion of active NPI records flagged as sole proprietors in NPPES: 788 records, or 15.0%. It can help address private-practice questions, but it is an imperfect proxy because the field is self-reported and may not capture practice ownership, employment arrangements, group structure, or clinical workload.

By state

New NPI registrations by year

Counts reflect the year each NPI was first issued, among records still active today. The final year is partial: this data covers through 2026-01-11.

Data notes

• The sole-proprietor field is self-reported by the provider in NPPES and is an imperfect proxy for private practice.
• A sole-proprietor count shown as <11 is suppressed: the true value is below 11, which could include zero.
• An NPI record is not necessarily a unique physician, and taxonomy data may not reflect current clinical focus or workload.
• State counts use NPPES reporting information and may not represent where care is delivered.
• Providers are counted once, by their primary taxonomy code only.

Source: CMS National Plan and Provider Enumeration System (NPPES) Data Dissemination file, FOIA-disclosable public data under CMS-6060-N. Aggregated by Hero EMR on 2026-08-03; deactivated NPIs excluded; specialty assigned from the primary taxonomy code (NUCC 25.1). Counts below 11 are suppressed. Individual providers are never published. All provider data pages.

Common questions