Quick answers
- Does Mary M. Rieger accept Medicare assignment?
- Yes. Medicare's clinician data says Mary M. Rieger accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Mary M. Rieger see?
- In 2024, CMS data shows 118 Original Medicare patients and 784 services for Mary M. Rieger. This counts Original Medicare only and measures volume, not quality.
- What is Mary M. Rieger's NPI number?
- 1134548399. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Mary M. Rieger, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 118 |
|---|---|
| Services billed to Medicare | 784 |
| Different services or procedures | 51 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)79 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)76 services
- Ultrasound measurement of bladder capacity after voiding (51798)47 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)38 services
- Insertion of device into abdomen with pressure and urine flow rate study (51797)19 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure67%
- Arthritis56%
- Diabetes30%
- Depression30%
- Anxiety25%
Hospitals where Mary M. Rieger works
Medicare's Facility Affiliation Data lists Mary M. Rieger at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Ascension Seton HaysKyle, TX · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 670056
- Ascension Seton Medical Center AustinAustin, TX · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 450056
Practice locations
Addresses where Mary M. Rieger is enrolled with Medicare (CMS data updated October 2, 2026). 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
- 1201 W 38th StAustin, TX 78705
- 1301 W 38th St, Suite 600 Ascension Medical Group Seton WomAustin, TX 78705 (512) 324‑8670
- 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 Mary M. Rieger as a member of these groups (CMS data updated October 2, 2026).
- Seton Family of Doctors792 clinicians in the group
- The University of Texas at Austin153 clinicians in the group
- University of Texas at Austin Dell Medical School151 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Austin
Clinicians with the same Medicare primary specialty in Austin, TX — not a recommendation.
Other clinicians in Seton Family of Doctors
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Baylor College Of Medicine |
| Graduation year | 2014 (12 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1134548399 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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