Quick answers
- Does Jillian R. Grzegorczyk accept Medicare assignment?
- Yes. Medicare's clinician data says Jillian R. Grzegorczyk 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 Jillian R. Grzegorczyk see?
- In 2024, CMS data shows 161 Original Medicare patients and 268 services for Jillian R. Grzegorczyk. This counts Original Medicare only and measures volume, not quality.
- What is Jillian R. Grzegorczyk's NPI number?
- 1942789805. 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 Jillian R. Grzegorczyk, 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 | 161 |
|---|---|
| Services billed to Medicare | 268 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)176 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)76 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%
- Ischemic heart disease75%
- Heart failure75%
- Chronic kidney disease65%
- Atrial fibrillation63%
Hospitals where Jillian R. Grzegorczyk works
Medicare's Facility Affiliation Data lists Jillian R. Grzegorczyk 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.
- Covenant Medical CenterSaginaw, MI · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 230070
- Spectrum HealthGrand Rapids, MI · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 230038
Practice locations
Addresses where Jillian R. Grzegorczyk is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 7; the Medicare profile lists all.
- 15100 Whittaker WayGrand Haven, MI 49417 (616) 772‑4644
- 15100 Whittaker Way, Corewell Health Medical Group WestGrand Haven, MI 49417 (616) 935‑6280
- 2009 Holton RdMuskegon, MI 49445
- 4100 Lake Dr SEGrand Rapids, MI 49546
- 4444 Kalamazoo Ave SE, 200 Corewell Health Medical Group WestKentwood, MI 49508 (616) 391‑5600
Group practices
Medicare enrollment lists Jillian R. Grzegorczyk as a member of these groups (CMS data updated October 2, 2026).
- Spectrum Health Primary Care Partners2,294 clinicians in the group
- Covenant Medical Center, Inc.480 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Grand Haven
Clinicians with the same Medicare primary specialty in Grand Haven, MI — not a recommendation.
Other clinicians in Spectrum Health Primary Care Partners
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2018 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1942789805 |
| 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