John B. Hagan, MD
Listed as an allergist, with a practice address in Rochester, Minnesota.
Practice location 1
Mayo Clinic
200 1st St SW
Rochester, MN 55905
From the records
- Specialty
- Allergist
- Records
- Medicare records: allergy/immunology (October 2026).
- Medicare
- Accepts the Medicare-approved amount as payment in full (Medicare assignment), according to CMS’s file. This applies to Original Medicare; Medicare Advantage plans have their own networks. What assignment means
- Telehealth
- Medicare’s file shows recent telehealth visits. It doesn’t mean every visit can be by video.
- Medical school
- University of Tennessee, Hsc, College of Medicine, graduated 1989 (Medicare records)
- Registry record
- Last updated August 2020
- NPI
- 1366429573 (national provider registry)
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From CMS’s Doctors and Clinicians file (October 2026) and the national provider registry, NPPES (October 2026). Listings are free and in alphabetical order; we don’t rate or recommend doctors. How we list doctors