Quick answers
- Does Michelle L. Mierzwa accept Medicare assignment?
- Yes. Medicare's clinician data says Michelle L. Mierzwa 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 L. Mierzwa see?
- In 2024, CMS data shows 108 Original Medicare patients and 1,258 services for Michelle L. Mierzwa. This counts Original Medicare only and measures volume, not quality.
- What is Michelle L. Mierzwa's NPI number?
- 1043421340. 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 L. Mierzwa, 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 | 108 |
|---|---|
| Services billed to Medicare | 1,258 |
| Different services or procedures | 33 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Ct guidance for insertion of radiation therapy fields (77014)652 services
- Radiation treatment management, 5 treatment sessions (77427)114 services
- Calculation of radiation therapy dose (77300)95 services
- Design and construction of complex radiation treatment device (77334)64 services
- Complex radiation therapy planning (77263)42 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 pressure70%
- High cholesterol55%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)38%
- Arthritis34%
- Ischemic heart disease30%
- Depression27%
Hospitals where Michelle L. Mierzwa works
Medicare's Facility Affiliation Data lists Michelle L. Mierzwa 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.
- Edward W Sparrow HospitalLansing, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230230
- 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 L. Mierzwa is enrolled with Medicare (CMS data updated October 2, 2026).
- 1215 E Michigan AveLansing, MI 48912 (517) 364‑5640
- 1500 E Medical Ctr DrAnn Arbor, MI 48109 (734) 936‑4300
Group practices
Medicare enrollment lists Michelle L. Mierzwa as a member of these groups (CMS data updated October 2, 2026).
- Regents of the University of Michigan3,346 clinicians in the group
- Edward W Sparrow Hospital Association730 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in Lansing
Clinicians with the same Medicare primary specialty in Lansing, 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 | MD |
|---|---|
| Medical school | University Of Cincinnati College Of Medicine |
| Graduation year | 2003 (23 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) | 1043421340 |
| 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