Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Rex B Williams, M.D.

Pain Medicine (Anesthesiology) Physician in Starkville, MS · enumerated 2006 · practices at Och Center for Pain Management.

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

National Provider Identifier

1821034596

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Registry record

Entity type Individual (Type 1)

Name Rex B Williams

Credential M.D.

Sex Male

Practice address 107 Doctors Park, Starkville, MS, 39759

Phone (662) 615-3751

Fax (662) 615-3754

Enumeration date Jun 21, 2006

Last updated in NPPES Oct 6, 2025

Taxonomy & licenses

207LP2900X Pain Medicine (Anesthesiology) Physician Allopathic & Osteopathic Physicians · License ME92922 (FL) Secondary

207LP2900X Pain Medicine (Anesthesiology) Physician Allopathic & Osteopathic Physicians · License 19128 (MS) 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
302G708049	Other	MS	MEDICARE PTAN

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 Rex Williams?

Rex Williams is registered in NPPES with the primary taxonomy of Pain Medicine (Anesthesiology) 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 2025-10-06.