Quick answers
- Which hospitals does Mark J. Pirwitz work at?
- Medicare's official clinician data lists Mark J. Pirwitz at 3 hospitals: Ascension Seton Highland Lakes, Ascension Seton Medical Center Austin and Ascension Seton Williamson. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark J. Pirwitz see patients?
- Medicare's clinician data lists 8 practice locations, including Austin, TX, Round Rock, TX and Kyle, TX. Call before your visit to confirm the address.
- What is Mark J. Pirwitz's specialty?
- Medicare lists Interventional Cardiology as the primary specialty, and also Cardiovascular Disease (Cardiology).
- Does Mark J. Pirwitz accept Medicare assignment?
- Yes. Medicare's clinician data says Mark J. Pirwitz 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.
- Does Mark J. Pirwitz offer telehealth?
- Medicare's clinician data says Mark J. Pirwitz offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark J. Pirwitz?
- (512) 324-3580, as listed in official Medicare / NPI Registry data.
- What is Mark J. Pirwitz's NPI number?
- 1063436152. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark J. Pirwitz works
Medicare's Facility Affiliation Data lists Mark J. Pirwitz at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ascension Seton Highland LakesBurnet, TX · Critical Access Hospital · CCN 451365
- Ascension Seton Medical Center AustinAustin, TX · Acute Care Hospital · CCN 450056
- Ascension Seton WilliamsonRound Rock, TX · Acute Care Hospital · CCN 670041
Practice locations
Addresses where Mark J. Pirwitz is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 8; the Medicare profile lists all.
- 1004 W 32nd St, 200 Ascension Texas Spine and ScoliosisAustin, TX 78705 (512) 324‑3580
- 11111 Research Blvd, Suite 300Austin, TX 78759 (844) 448‑8124
- 1201 W 38th StAustin, TX 78705
- 1400 N Ih 35Austin, TX 78701
- 1400 N Ih 35 Ll, Cl400 Tri County Prac AssocAustin, TX 78701 (512) 324‑7300
Group practices
Medicare enrollment lists Mark J. Pirwitz as a member of this group (CMS data updated 2026-10-02).
- Seton Family of Doctors792 clinicians in the group
Specialties
Other interventional cardiologists in Austin
Clinicians with the same Medicare primary specialty in Austin, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Southwestern Medical School At Dallas |
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1063436152 |
| 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