Quick answers
- Does Michelle A. Petrak accept Medicare assignment?
- Yes. Medicare's clinician data says Michelle A. Petrak 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 Michelle A. Petrak see?
- In 2024, CMS data shows 98 Original Medicare patients and 102 services for Michelle A. Petrak. This counts Original Medicare only and measures volume, not quality.
- What is Michelle A. Petrak's NPI number?
- 1881013175. 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 Michelle A. Petrak, 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 | 98 |
|---|---|
| Services billed to Medicare | 102 |
| Different services or procedures | 26 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Anesthesia for lens surgery (00142)16 services
- Anesthesia for other procedure on large bowel using an endoscope (00811)11 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 blood pressure66%
- High cholesterol62%
- Arthritis41%
- Diabetes32%
- Chronic kidney disease26%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)26%
Hospitals where Michelle A. Petrak works
Medicare's Facility Affiliation Data lists Michelle A. Petrak 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.
- University of Michigan Health SystemAnn Arbor, MI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 230046
Practice locations
Addresses where Michelle A. Petrak is enrolled with Medicare (CMS data updated October 2, 2026).
- 1500 E Medical Ctr DrAnn Arbor, MI 48109 (734) 936‑4000
- 4270 Plymouth RdAnn Arbor, MI 48109 (734) 936‑4000
- 7500 Challis RdBrighton, MI 48116 (734) 936‑4000
Group practices
Medicare enrollment lists Michelle A. Petrak as a member of this group (CMS data updated October 2, 2026).
- Regents of the University of Michigan3,346 clinicians in the group
Specialties
Find other clinicians: Certified Registered Nurse Anesthetist (CRNA), Michigan →
Other nurse anesthetists in Ann Arbor
Clinicians with the same Medicare primary specialty in Ann Arbor, MI — not a recommendation.
Other clinicians in Regents of the University of Michigan
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | CNA |
|---|---|
| Graduation year | 2013 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1881013175 |
| 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