NPI age
20 years
Enumerated 2006-05-15
● Active Type 2 · Organization
John C. Williamson, MD
John C. Williamson, MD is 1 of 4038 specialist organizations in Texas.
Primary specialty
Specialist
Practice locations
1
0 secondary on file
Status
Active
No deactivations on record
Authorized official
Moore
Billing Manager
Last NPPES update
2008-08-14
Source: monthly bulk 2026-05
How this organization compares
Across 4038 active specialist providers in Texas.
NPI age
20 years
↑ 2 yr above median
Practice locations
1
0 secondary on file
Subspecialties
0
NPI lifetime · 2006 → 2026
2006-05Enumerated in NPPES
2006
2026
Where they practice
Primary practice location
4007 James Casey St, C150
Austin, TX 787453369
Mailing address
4007 James Casey St, C150
Austin, TX 787453369
Authorized official
Monica Moore
Billing Manager
📞 5126173522
Individual providers at this organization
9 individual providers on file at this primary practice address.
- Sasan Askari, M.D. Obstetrics & Gynecology NPI 1013986843
- James Black, MD Psychiatry & Neurology NPI 1992818355
- Anne Epstein, M.D. Dermatology NPI 1912964172
- David Folkers, M.D. Surgery NPI 1538265442
- Barbara Howard, WHNP Clinical Nurse Specialist NPI 1346540572
- Larry Lewellyn, D.O. Pediatrics NPI 1821064098
- Donald Ward, M.D. Specialist NPI 1093790222
- John Williamson, M.D. Urology NPI 1073566709
- Harvey Worchel, M.D. Surgery NPI 1841271483
Specialties
-
Specialist PrimaryAn individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
Identifiers
| Type | Value | Notes |
|---|---|---|
| 05 (TX) | 082871701 | |
| 01 (TX) | 00H05E | BLUE CROSS BLUE SHIELD |
Other names on file (1)
Doing-business-as, former, and alternate names recorded by NPPES.
-
Capitol Urology Associates
Practice context
Multi-provider organization. 9 individual providers on file at this primary address.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
- Verify the organization is in good standing.Cross-check with the state's business registration and any applicable licensing boards.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.