Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Jay A. Keystone, MD

Individual provider Allergy & Immunology Physician · NPI 1306115001

Jay A. Keystone, MD is an Internal Medicine in Vacaville, California. Graduated from University of Michigan Medical School in 1970, 56 years ago. Practices as a sole proprietor and offers telehealth. Licensed in California.

Years since qualifying
56
Trained at
University of Michigan Medical School
Licensed in
CA
In the registry since
2011
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

365 Evergreen Dr
Vacaville, CA 95688-2136
Phone: (707) 446-8581
Fax: (707) 446-8581
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Allergy & Immunology (Internal Medicine) Physician (primary) Taxonomy 207RA0201X · Licence C29865 (CA)
Allergy & Immunology Physician Taxonomy 207K00000X · Licence C29865 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence C29865 (CA)

Record details

NPI number1306115001
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedDecember 26, 2011
Last updated in NPPESApril 9, 2020
Certification dateApril 9, 2020
Mailing address365 Evergreen Dr, Vacaville, CA 95688-2136

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MICHIGAN MEDICAL SCHOOL
Graduated 1970 (56 years in practice)
Accepts Medicare assignment Not indicated
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

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