NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jay Lance Gregston, M.D.

Emergency Medicine Physician in Duncan, OK · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1871581512

Verified

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Registry record

Entity type Individual (Type 1)
Name Dr. Jay Lance Gregston
Credential M.D.
Sex Male
Practice address 2004 N Highway 81, Duncan, OK, 73533
Phone (580) 252-1911
Fax (580) 252-1020
Enumeration date Oct 6, 2005
Last updated in NPPES Jan 17, 2024

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 20226 (OK) Primary
207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 20226 (OK) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
100254370A Medicaid OK -
200069940A Medicaid OK -
200116880B Medicaid OK -
100254370B Medicaid OK -
200116880A Medicaid OK -

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

What specialty is Jay Gregston?
Jay Gregston is registered in NPPES with the primary taxonomy of Emergency Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-01-17.