Quick answers
- Does Sonya Inderbitzin-Fischer accept Medicare assignment?
- Yes. Medicare's clinician data says Sonya Inderbitzin-Fischer 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 Sonya Inderbitzin-Fischer see?
- In 2024, CMS data shows 80 Original Medicare patients and 10,478 services for Sonya Inderbitzin-Fischer. This counts Original Medicare only and measures volume, not quality.
- What is Sonya Inderbitzin-Fischer's NPI number?
- 1184128670. 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 Sonya Inderbitzin-Fischer, 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 | 80 |
|---|---|
| Services billed to Medicare | 10,478 |
| Different services or procedures | 115 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)82 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)80 services
- Blood test, comprehensive group of blood chemicals (80053)57 services
- Injection of additional new drug or substance into vein (96375)40 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)33 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 pressure73%
- Arthritis58%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)40%
- Ischemic heart disease38%
- Chronic kidney disease33%
Hospitals where Sonya Inderbitzin-Fischer works
Medicare's Facility Affiliation Data lists Sonya Inderbitzin-Fischer 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.
- Corewell Health Pennock HospitalHastings, MI · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 231339
- Holland HospitalHolland, MI · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 230072
- Mercy Health Saint Mary'sGrand Rapids, MI · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 230059
- Spectrum HealthGrand Rapids, MI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 230038
- Spectrum Health United HospitalGreenville, MI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: not listed by Medicare · CCN 230035
Practice locations
Addresses where Sonya Inderbitzin-Fischer is enrolled with Medicare (CMS data updated October 2, 2026).
- 12460 Riley StHolland, MI 49424 (616) 399‑6500
Group practices
Medicare enrollment lists Sonya Inderbitzin-Fischer as a member of this group (CMS data updated October 2, 2026).
- Cancer and Hematology Centers of Western Mi, P.C.110 clinicians in the group
Specialties
- Hematologyprimary
- Internal Medicinealso
Other hematologists in Michigan
Clinicians with the same Medicare primary specialty in Michigan — not a recommendation.
Other clinicians in Cancer and Hematology Centers of Western Mi, P.C.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | West Virginia University School Of Medicine |
| Graduation year | 2018 (8 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1184128670 |
| 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