NPI age
11 years
Enumerated 2014-06-30
● Active
Type 1 · Individual
Michael Patrick Duffy, D.O.
Duffy is 1 of 3 technician/technologist providers in San Marcos and 1 of 498 in Texas.
Primary specialty
Technician/Technologist
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2014-06-30
Source: monthly bulk 2026-05
Sole proprietor
Yes
Solo practice on file
How this provider compares
Across 498 active technician/technologist providers in Texas.
NPI age
11 years
≈ at median (10 yr)
State licenses
1 state
0% of peers hold multiple states
Subspecialties
0
10% of peers hold subspecialties
NPI lifetime · 2014 → 2026
2014-06Enumerated in NPPES
2014
2026
Where they practice
Practice location
121 W San Antonio St
San Marcos, TX 786665551
Mailing address
121 W San Antonio St
San Marcos, TX 786665551
Specialties
-
Technician/Technologist PrimaryOpticians help fit eyeglasses and contact lenses, following prescriptions from Ophthalmologists and Optometrists. They also help customers decide which eyeglass frame or contact lenses to buy.
Practice context
Part of a multi-provider practice. 2 other active providers share this practice address in NPPES.
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- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
- Check the state license is currently active.State licensing boards publish current status; NPPES does not.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.