Quick answers
- Does Aaron R. Zarnosky accept Medicare assignment?
- Yes. Medicare's clinician data says Aaron R. Zarnosky 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 Aaron R. Zarnosky see?
- In 2024, CMS data shows 162 Original Medicare patients and 17,343 services for Aaron R. Zarnosky. This counts Original Medicare only and measures volume, not quality.
- What is Aaron R. Zarnosky's NPI number?
- 1811915721. 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 Aaron R. Zarnosky, 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 | 162 |
|---|---|
| Services billed to Medicare | 17,343 |
| Different services or procedures | 93 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Injection, ferric derisomaltose, 10 mg (J1437)1,100 services
- Insertion of needle into vein for collection of blood sample (36415)177 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)167 services
- Blood test, comprehensive group of blood chemicals (80053)106 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)98 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 cholesterol72%
- Arthritis51%
- Diabetes33%
- Depression31%
- Ischemic heart disease28%
Hospitals where Aaron R. Zarnosky works
Medicare's Facility Affiliation Data lists Aaron R. Zarnosky 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
- 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
- University of Michigan Health - WestWyoming, MI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 230236
Practice locations
Addresses where Aaron R. Zarnosky is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.
- 12460 Riley StHolland, MI 49424 (616) 399‑6500
- 145 Michigan St NE, Suite 3100Grand Rapids, MI 49503 (616) 954‑9800
- 15100 220th AveBig Rapids, MI 49307 (231) 515‑9410
- 302 Kensington AveFlint, MI 48503 (810) 762‑8400
- 6425 S Harvey StNorton Shores, MI 49444 (231) 737‑3469
Group practices
Medicare enrollment lists Aaron R. Zarnosky 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
- Physician Assistantprimary
Other physician assistants in Holland
Clinicians with the same Medicare primary specialty in Holland, MI — 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
| Graduation year | 2002 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1811915721 |
| 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