Quick answers
- Where does Eric S. Casillas see patients?
- Medicare's clinician data lists 2 practice locations, including San Antonio, TX. Call before your visit to confirm the address.
- What is Eric S. Casillas's specialty?
- Medicare lists Optometry as the primary specialty.
- Does Eric S. Casillas accept Medicare assignment?
- Yes. Medicare's clinician data says Eric S. Casillas accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Eric S. Casillas?
- (210) 495-7483, as listed in official Medicare / NPI Registry data.
- What is Eric S. Casillas's NPI number?
- 1649269697. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Eric S. Casillas is enrolled with Medicare (CMS data updated 2026-10-02).
- 22906 US Hwy 281 N, Suite 101San Antonio, TX 78258 (210) 495‑7483
- 4437 De Zavala Rd, Suite ASan Antonio, TX 78249 (210) 492‑7483
Group practices
Medicare enrollment lists Eric S. Casillas as a member of this group (CMS data updated 2026-10-02).
- Med Southwest PLLC229 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in San Antonio
Clinicians with the same Medicare primary specialty in San Antonio, TX — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1649269697 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians