Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Aston B Williams, MD

Gastroenterology Physician in Buffalo, NY · enumerated 2006.

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

National Provider Identifier

1558423921

Verified

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Registry record

Entity type Individual (Type 1)

Name Aston B Williams

Credential MD

Sex Male

Practice address 2804 Main St, Buffalo, NY, 14214

Phone (716) 832-1776

Enumeration date Dec 14, 2006

Last updated in NPPES Jun 17, 2011

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 158446 (NY) Primary

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License 158446 (NY) 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
01028555	Medicaid	NY	-
505857001	Other	-	BLUE CROSS

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

Where does Aston Williams practice?

The practice location on file with NPPES is in Buffalo, NY. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Aston Williams?

The National Provider Identifier (NPI) for Aston Williams is 1558423921, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-06-17.