John C. Williamson, MD

John C. Williamson, MD is a healthcare organization registered as Specialist in Austin, TX, holding Type 2 (organization) NPI 1578514311 since 2006. The authorized official on file is Monica Moore, Billing Manager.

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NPI	1578514311
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	5126173522
Fax	5124431062
Enumeration date	2006-05-15
Last updated in NPPES	2008-08-14

Authorized official

Name	Monica Moore
Title	Billing Manager
Phone	5126173522

Taxonomy & classification

Taxonomy code	Specialty	Primary	License	State
174400000X	Specialist	Primary	—	—

Other identifiers

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

Copy-ready billing details

Provider: John C. Williamson, MD
NPI: 1578514311
Taxonomy: 174400000X (Specialist)
Address: 4007 JAMES CASEY ST, C150, Austin, TX, 78745

Providers at this address

NPI	Name	Type	Specialty	Location
1841271483	Harvey Worchel	Individual	Surgery Physician	Austin, TX
1093790222	Donald Ward	Individual	Specialist	Austin, TX
1811968332	Pediatrics of South Austin, P.A.	Organization	Pediatrics Physician	Austin, TX
1821064098	Larry Lewellyn	Individual	Pediatrics Physician	Austin, TX
1013986843	Sasan Askari	Individual	Obstetrics & Gynecology Physician	Austin, TX
1912964172	Anne Epstein	Individual	Dermatology Physician	Austin, TX
1073566709	John Williamson	Individual	Urology Physician	Austin, TX
1538265442	David Folkers	Individual	Surgery Physician	Austin, TX

Verify this record

Cross-check NPI 1578514311 against the authoritative CMS record: view John C. Williamson, MD on the official NPPES registry .

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 or validate an NPI number.

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.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2008-08-14.