Quick answers
- Which hospitals does Sylvia E. Keiser work at?
- Medicare's official clinician data lists Sylvia E. Keiser at 1 hospital: University Health System. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sylvia E. Keiser see patients?
- Medicare's clinician data lists 2 practice locations, including Boerne, TX and San Antonio, TX. Call before your visit to confirm the address.
- What is Sylvia E. Keiser's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Sylvia E. Keiser accept Medicare assignment?
- Medicare's clinician data says Sylvia E. Keiser may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is Sylvia E. Keiser's NPI number?
- 1366063463. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sylvia E. Keiser works
Medicare's Facility Affiliation Data lists Sylvia E. Keiser at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- University Health SystemSan Antonio, TX · Acute Care Hospital · CCN 450213
Practice locations
Addresses where Sylvia E. Keiser is enrolled with Medicare (CMS data updated 2026-10-02).
- 29703 Millwood WayBoerne, TX 78015
- 8431 Fredericksburg Rd, Fl 5San Antonio, TX 78229
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Boerne
Clinicians with the same Medicare primary specialty in Boerne, TX — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2020 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1366063463 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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