John Byrne, MD
Listed as an allergist, with 3 practice addresses in Riverhead, Port Jefferson Station, and South Setauket, New York.
Practice locations 3
1149 Old Country Rd, Suite E1
Riverhead, NY 119012 Medical Dr C
Port Jefferson Station, NY 11776Three Village Allergy and Asthma, PLLC
3771 Nesconset Hwy, Suite 105
South Setauket, NY 11720
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
- Medical school
- New York Medical College, graduated 1995 (Medicare records)
- Registry record
- Last updated May 2014
- NPI
- 1144227208 (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