Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John Charles Williamson, M.D.

Urology Physician in Austin, TX · enumerated 2006.

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

National Provider Identifier

1073566709

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Registry record

Entity type Individual (Type 1)

Name John Charles Williamson

Credential M.D.

Sex Male

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

Phone (512) 443-5988

Fax (512) 443-5055

Enumeration date May 17, 2006

Last updated in NPPES Jul 31, 2013

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License E6690 (TX) 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
114581504	Medicaid	TX	-

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

Is NPI 1073566709 active?

Yes, as of the latest NPPES snapshot, NPI 1073566709 is active (record last updated 2013-07-31).

How do I verify John Williamson's NPI record?

Cross-check NPI 1073566709 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-07-31.