Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

John C. Williamson, MD

Specialist in Austin, TX · enumerated 2006 · authorized official Monica Moore, Billing Manager.

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

National Provider Identifier

1578514311

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Registry record

Entity type Organization (Type 2)

Legal business name John C. Williamson, MD

Other name <Unavail>

Practice address 4007 James Casey St, C150, Austin, TX, 78745

Phone (512) 617-3522

Fax (512) 443-1062

Enumeration date May 15, 2006

Last updated in NPPES Aug 14, 2008

Taxonomy & classification

174400000X Specialist Other Service Providers Primary

Authorized official

Name Monica Moore

Title Billing Manager

Phone (512) 617-3522

Other identifiers

Identifier	Type	State	Issuer
082871701	Medicaid	TX	-
00H05E	Other	TX	BLUE CROSS BLUE SHIELD

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

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2008-08-14. Verify at npiregistry.cms.hhs.gov.

Where is John C. Williamson, MD located?

The practice location on file with NPPES is in Austin, TX.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-08-14.