Quick answers
- Which hospitals does Gregory J. Vanwienen work at?
- Medicare's official clinician data lists Gregory J. Vanwienen at 1 hospital: Mercy Health Saint Mary's. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory J. Vanwienen see patients?
- Medicare's clinician data lists 1 practice location in Jenison, MI. Call before your visit to confirm the address.
- What is Gregory J. Vanwienen's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Gregory J. Vanwienen accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory J. Vanwienen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Gregory J. Vanwienen?
- (616) 685-8700, as listed in official Medicare / NPI Registry data.
- What is Gregory J. Vanwienen's NPI number?
- 1194771972. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory J. Vanwienen works
Medicare's Facility Affiliation Data lists Gregory J. Vanwienen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Health Saint Mary'sGrand Rapids, MI · Acute Care Hospital · CCN 230059
Practice locations
Addresses where Gregory J. Vanwienen is enrolled with Medicare (CMS data updated 2026-10-02).
- 7782 20th AveJenison, MI 49428 (616) 685‑8700
Group practices
Medicare enrollment lists Gregory J. Vanwienen as a member of this group (CMS data updated 2026-10-02).
- Advantage Health/Saint Mary's Medical Group505 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Jenison
Clinicians with the same Medicare primary specialty in Jenison, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Michigan State University College Of Human Medicine |
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1194771972 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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