Quick answers
- Does Katherine R. Ritzema accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine R. Ritzema 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.
- What is Katherine R. Ritzema's NPI number?
- 1326702754. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Katherine R. Ritzema is enrolled with Medicare (CMS data updated October 2, 2026).
- 300 Lafayette Ave SE, Suite 3000Grand Rapids, MI 49503 (616) 685‑6919
Group practices
Medicare enrollment lists Katherine R. Ritzema as a member of this group (CMS data updated October 2, 2026).
- Advantage Health/Saint Mary's Medical Group505 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Grand Rapids
Clinicians with the same Medicare primary specialty in Grand Rapids, MI — not a recommendation.
Other clinicians in Advantage Health/Saint Mary's Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2021 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1326702754 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- 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