Quick answers
- Which hospitals does Shannon A. Markus work at?
- Medicare's official clinician data lists Shannon A. Markus at 5 hospitals: Ascension Seton Northwest, Ascension Seton Southwest, Dell Seton Medical Center at the University of TX, North Austin Medical Center and St David's Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Shannon A. Markus see patients?
- Medicare's clinician data lists 4 practice locations, including Round Rock, TX, San Antonio, TX and The Woodlands, TX. Call before your visit to confirm the address.
- What is Shannon A. Markus's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Shannon A. Markus accept Medicare assignment?
- Yes. Medicare's clinician data says Shannon A. Markus 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 Shannon A. Markus?
- (512) 341-1000, as listed in official Medicare / NPI Registry data.
- What is Shannon A. Markus's NPI number?
- 1174057889. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Shannon A. Markus works
Medicare's Facility Affiliation Data lists Shannon A. Markus at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ascension Seton NorthwestAustin, TX · Acute Care Hospital · CCN 450867
- Ascension Seton SouthwestAustin, TX · Acute Care Hospital · CCN 450865
- Dell Seton Medical Center at the University of TXAustin, TX · Acute Care Hospital · CCN 450124
- North Austin Medical CenterAustin, TX · Acute Care Hospital · CCN 450809
- St David's Medical CenterAustin, TX · Acute Care Hospital · CCN 450431
Practice locations
Addresses where Shannon A. Markus is enrolled with Medicare (CMS data updated 2026-10-02).
- 2400 Round Rock AveRound Rock, TX 78681 (512) 341‑1000
- 3154 SE Military Dr, Suite 103 Methodist ER City BaseSan Antonio, TX 78223 (210) 757‑1200
- 3759 FM 1488 Rd, Suite 500The Woodlands, TX 77384 (936) 270‑4750
- 919 E 32nd St, St David'S Med CtrAustin, TX 78705 (830) 997‑4353
Group practices
Medicare enrollment lists Shannon A. Markus as a member of these groups (CMS data updated 2026-10-02).
- Emergency Medicine Services of TX, PLLC400 clinicians in the group
- Travis County Emergency Physicians PA327 clinicians in the group
- Longhorn Emergency Medical Associates PA159 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Round Rock
Clinicians with the same Medicare primary specialty in Round Rock, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Perelman School Of Med At The University Of Pennsylvania |
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1174057889 |
| 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