NPI age
8 years
Enumerated 2018-03-08
● Active Type 2 · Organization
Duncan A Friedman MD PA
Duncan A Friedman MD PA is 1 of 139 ophthalmology organizations in Texas.
Primary specialty
Ophthalmology
Plus 1 secondary
Practice locations
2
1 secondary on file
Status
Active
No deactivations on record
Authorized official
Friedman
Administrator
Last NPPES update
2026-05-01
Source: monthly bulk 2026-05
How this organization compares
Across 139 active ophthalmology providers in Texas.
NPI age
8 years
↓ 8 yr below median
Practice locations
2
1 secondary on file
Subspecialties
1
In the 77% of peers with subspecialties
NPI lifetime · 2018 → 2026
2018-03Enumerated in NPPES
2018
2026
Where they practice
Primary practice location
622 Isom Rd
San Antonio, TX 782164464
Mailing address
622 Isom Rd
San Antonio, TX 782164464
Additional practice locations
1 secondary location on file with NPPES.
Location 2
931 E Main St
Uvalde, TX 788014855
Authorized official
Duncan Aesctun Friedman, MD
Administrator
📞 2108803000
Individual providers at this organization
6 individual providers on file at this primary practice address.
- Tabitha Castillo, DPT Physical Therapist NPI 1205517596
- Duncan Friedman, M.D. Ophthalmology NPI 1457512725
- John Hogg, MD Radiology NPI 1407850209
- Josue Medina, MD Phlebology NPI 1437311321
- Thomas Oei, MD Ophthalmology NPI 1861468530
- Brenda Villarreal, FNP-C Nurse Practitioner NPI 1427767797
Specialties
-
Ophthalmology PrimaryAn ophthalmologist who specializes in the diagnosis and treatment of vitreoretinal diseases.
-
OphthalmologyAn ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual...
Practice context
Multi-provider organization. 6 individual providers on file at this primary address. Plus 1 secondary practice location.
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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.