Jay A Keystone, MD - Medicare Internal Medicine in Vacaville, CA

Jay A Keystone, MD is a medicare enrolled "Internal Medicine - Allergy & Immunology" physician in Vacaville, California. His current practice location is 365 Evergreen Dr, Vacaville, California. You can reach out to his office (for appointments etc.) via phone at (707) 446-8581.

Jay A Keystone is licensed to practice in California (license number C29865) and he also participates in the medicare program. He does not accept medicare assignments directly but he may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. His NPI Number is 1306115001.

Contact Information

Jay A Keystone, MD
365 Evergreen Dr,
Vacaville, CA 95688-2136
(707) 446-8581
(707) 446-8581

Map and Direction




Physician's Profile

Full NameJay A Keystone
GenderMale
SpecialityInternal Medicine - Allergy & Immunology
Location365 Evergreen Dr, Vacaville, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1306115001
  • Provider Enumeration Date: 12/26/2011
  • Last Update Date: 04/09/2020
  Medicare PECOS Information:
  • PECOS PAC ID: 8325383250
  • Enrollment ID: I20181221001193

Medical Identifiers

Medical identifiers for Jay A Keystone such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1306115001NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207K00000XAllergy & Immunology C29865 (California)Secondary
207R00000XInternal Medicine C29865 (California)Secondary
207RA0201XInternal Medicine - Allergy & Immunology C29865 (California)Primary

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Jay A Keystone allows following entities to bill medicare on his behalf.
Entity NameCares Community Health
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1447297379
PECOS PAC ID: 2769418151
Enrollment ID: O20050718000377
Entity NamePlushcare Of California Inc A Professional Corporation
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1811378987
PECOS PAC ID: 2365707163
Enrollment ID: O20180529000602

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Jay A Keystone is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Jay A Keystone, MD
365 Evergreen Dr,
Vacaville, CA 95688-2136

Ph: (707) 446-8581
Jay A Keystone, MD
365 Evergreen Dr,
Vacaville, CA 95688-2136

Ph: (707) 446-8581

Reviews and Comments


Internal Medicine Doctors in Vacaville, CA

Dr. Jason Rohrer, M.D.
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Medicare: Not Enrolled in Medicare
Practice Location: Po Box 4000, Vacaville, CA 95696
Phone: 707-451-0182    
Liyan Zhang, MD
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Medicare: Accepting Medicare Assignments
Practice Location: 1 Quality Dr, Vacaville, CA 95688
Phone: 707-453-5000    
Marissa C. Neis-gimenez, MD
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Medicare: Medicare Enrolled
Practice Location: 1 Quality Dr, Vacaville, CA 95688
Phone: 707-453-5000    
David M Woodhouse, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 770 Mason St, Vacaville, CA 95688
Phone: 707-454-5800    Fax: 707-454-5911
Richard M Tan, M.D.
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 2100 Peabody Rd., Vacaville, CA 95696
Phone: 707-451-0182    
Bethlehem Haile, M.D
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 1600 California Dr, Vacaville, CA 95687
Phone: 707-453-7007    Fax: 707-453-7009
Gregory Yervant Warner, D.O.
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 1010 Nut Tree Rd, Suite 100b, Vacaville, CA 95687
Phone: 707-624-7999    Fax: 707-624-7998

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.