NPI Portal NPI Lookup & Verification

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Dr. Michael D Williams, MD

Gastroenterology Physician in Columbia, MO · enumerated 2006 · practices at Gastrointestinal Associates, LLC.

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

National Provider Identifier

1750334470

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Registry record

Entity type Individual (Type 1)
Name Dr. Michael D Williams
Credential MD
Sex Male
Practice address 210 Portland St Ste 100, Columbia, MO, 65201
Phone (573) 777-8818
Fax (573) 777-8819
Enumeration date May 17, 2006
Last updated in NPPES Oct 6, 2022

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 2017008968 (MO) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 Michael Williams?
Michael Williams is registered in NPPES with the primary taxonomy of Gastroenterology 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 2022-10-06.