Jay A. Keystone, MD
Listed as an allergist, with 2 practice addresses in Bethpage, New York, and Sacramento, California.
Practice locations 2
15 Grumman Rd W, Suite 1400
Bethpage, NY 117141500 21st St
Sacramento, CA 95811
From the records
- Specialty
- Allergist
- Records
- Medicare records: Internal Medicine (October 2026). Allergy specialty from the national provider registry.
- Medicare
- May accept 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
- University of Michigan Medical School, graduated 1970 (Medicare records)
- Registry record
- Last updated April 2020
- NPI
- 1306115001 (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