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Allergists (Internal Medicine) in Indiana

Data updated monthly · Last refresh October 2026

7 Allergy & Immunology (Internal Medicine) providers practice in Indiana. The largest concentration is in Indianapolis. Profiles include federal Open Payments records of money received from drug and device companies in 2025. Listings are drawn from federal public records and are not endorsements.

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Allergy & Immunology (Internal Medicine) by city in Indiana

Choose a city to see providers there.

Allergy & Immunology (Internal Medicine) in Indianapolis2 providers
Allergy & Immunology (Internal Medicine) in South Bend1 providers
Allergy & Immunology (Internal Medicine) in Fort Wayne1 providers
Allergy & Immunology (Internal Medicine) in Terre Haute1 providers
Allergy & Immunology (Internal Medicine) in Richmond1 providers
Allergy & Immunology (Internal Medicine) in Elkhart1 providers

Allergy & Immunology (Internal Medicine) providers in Indiana

Listed by city, largest first. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.

Dr. Geoffrey Rogers, M.D.
Elkhart, IN · $445 in drug and device payments (2025) · (574) 296-3314
Dr. Douglas Neeld, MD
Fort Wayne, IN · $1,084 in drug and device payments (2025) · (260) 425-6070
Dr. Joseph Gaddy, M.D.
Indianapolis, IN · No drug or device payments recorded (2025) · (317) 396-2347
Dr. William Baker, M.D.
Indianapolis, IN · No drug or device payments recorded (2025) · (317) 988-3190
Dr. Jason Casselman, D.O.
Richmond, IN · $259 in drug and device payments (2025) · (765) 966-9600
Dr. Robert Clausen, MD
South Bend, IN · No drug or device payments recorded (2025) · (574) 237-9217
Dr. Diane Jordan-wagner, M.D.
Terre Haute, IN · No drug or device payments recorded (2025) · (812) 232-0564

Common questions

How many Allergy & Immunology (Internal Medicine) providers are in Indiana?

There are 7 Allergy & Immunology (Internal Medicine) providers with active NPI records practicing in Indiana, according to federal NPPES data refreshed monthly.

Which cities in Indiana have the most Allergy & Immunology (Internal Medicine) providers?

Indianapolis (2), South Bend (1), Fort Wayne (1) have the highest concentration of Allergy & Immunology (Internal Medicine) providers in Indiana.

Where does this data come from?

Provider counts and profiles come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.

Related reading on HealthcareDiscovery.AI

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Sources: NPPES (CMS), Doctors and Clinicians national files, CMS Open Payments 2025. Updated monthly. Records are public federal data and are not verified credentials, licensure checks, or endorsements. This directory is informational and not medical advice. How we build this directory. Are you a Allergy & Immunology (Internal Medicine) in Indiana? Get featured.