Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Robert G Day, MD

Family Medicine Physician in Lexington, TN · enumerated 2005.

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

National Provider Identifier

1235120437

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Registry record

Entity type Individual (Type 1)

Name Dr. Robert G Day

Credential MD

Sex Male

Practice address 9550 Highway 412 W Ste C, Lexington, TN, 38351

Phone (731) 968-1400

Fax (731) 968-1003

Enumeration date Nov 4, 2005

Last updated in NPPES Dec 14, 2023

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 2005-00933 (NC) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 6042A (WY) Secondary

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 0000058871 (TN) Primary

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
2549699	Other	NC	UNITED HEALTHCARE
E4406-80398	Other	NC	MEDCOST
800253	Other	NC	PARTNERS MEDICARE
140C8	Other	NC	BCBS OF NC

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

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.

What specialty is Robert Day?

Robert Day is registered in NPPES with the primary taxonomy of Family Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-12-14.