NPI age
20 years
Enumerated 2005-08-11
● Active
Type 1 · Individual
Marsha Hillary Onan, M.D.
Onan is 1 of 146 ophthalmology providers in Austin and 1 of 2155 in Texas.
Primary specialty
Ophthalmology
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2012-08-16
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 2155 active ophthalmology providers in Texas.
NPI age
20 years
≈ at median (19 yr)
State licenses
1 state
9% of peers hold multiple states
Subspecialties
0
31% of peers hold subspecialties
NPI lifetime · 2005 → 2026
2005-08Enumerated in NPPES
2005
2026
Where they practice
Practice location
11111 Research Blvd, Suite 220
Austin, TX 787595264
Mailing address
1600 W 38th St, Suite 320
Austin, TX 787316400
Specialties
-
Ophthalmology PrimaryAn 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...
Identifiers
| Type | Value | Notes |
|---|---|---|
| 05 (TX) | 117115905 |
Practice context
Part of a multi-provider practice. 21 other active providers share this practice address in NPPES.
Recently enumerated nearby: 2 new ophthalmology providers have been added in Austin in the last 180 days.
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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.