Quick answers
- Does Genevieve Sierminski accept Medicare assignment?
- Yes. Medicare's clinician data says Genevieve Sierminski 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 Genevieve Sierminski see?
- In 2024, CMS data shows 577 Original Medicare patients and 2,015 services for Genevieve Sierminski. This counts Original Medicare only and measures volume, not quality.
- What is Genevieve Sierminski's NPI number?
- 1376742858. 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 Genevieve Sierminski, 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 | 577 |
|---|---|
| Services billed to Medicare | 2,015 |
| Different services or procedures | 17 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)656 services
- Dialysis services, 4 or more physician visits per month (20 years or older) (90960)346 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)281 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)148 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)131 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 pressure75%
- High cholesterol75%
- Chronic kidney disease75%
- Diabetes63%
- Arthritis54%
- Ischemic heart disease54%
Hospitals where Genevieve Sierminski works
Medicare's Facility Affiliation Data lists Genevieve Sierminski 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 Genesys HospitalGrand Blanc, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230197
- Henry Ford Health HospitalDetroit, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230053
- Hurley Medical CenterFlint, MI · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 230132
- McLaren FlintFlint, MI · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 230141
- Memorial HealthcareOwosso, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230121
Practice locations
Addresses where Genevieve Sierminski is enrolled with Medicare (CMS data updated October 2, 2026).
- 208 N Shiawassee StOwosso, MI 48867 (989) 472‑3750
- G3404 Miller RdFlint, MI 48507 (810) 238‑4172
Group practices
Medicare enrollment lists Genevieve Sierminski as a member of this group (CMS data updated October 2, 2026).
- Nephrology and Internal Medicine PC9 clinicians in the group
Specialties
- Nephrologyprimary
Other nephrologists in Owosso
Clinicians with the same Medicare primary specialty in Owosso, MI — not a recommendation.
Other clinicians in Nephrology and Internal Medicine PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1999 (27 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) | 1376742858 |
| 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