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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Keith Alexander Guest, M.D.

Geriatric Medicine (Internal Medicine) Physician in Lexington, SC · enumerated 2005.

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

National Provider Identifier

1285630020

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Registry record

Entity type Individual (Type 1)
Name Keith Alexander Guest
Credential M.D.
Sex Male
Practice address Po Box 487, Lexington, SC, 29071
Phone (803) 699-9073
Fax (866) 527-0937
Enumeration date Jun 27, 2005
Last updated in NPPES Jul 21, 2025

Taxonomy & licenses

207RH0002X Hospice and Palliative Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 20934 (SC) Secondary
207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 20934 (SC) 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
GP2916 Medicaid SC -
380001558 Other SC RAILROAD MEDICARE

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Keith Guest?
Keith Guest is registered in NPPES with the primary taxonomy of Geriatric Medicine (Internal 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 2025-07-21.