Quick answers
- Does Mary K. Nissen accept Medicare assignment?
- Yes. Medicare's clinician data says Mary K. Nissen 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 Mary K. Nissen's NPI number?
- 1659604403. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mary K. Nissen works
Medicare's Facility Affiliation Data lists Mary K. Nissen 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.
- Shenandoah Medical CenterShenandoah, IA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 161366
Practice locations
Addresses where Mary K. Nissen is enrolled with Medicare (CMS data updated October 2, 2026).
- 1 Jack Foster DrShenandoah, IA 51601 (712) 246‑7240
Group practices
Medicare enrollment lists Mary K. Nissen as a member of this group (CMS data updated October 2, 2026).
- Shenandoah Medical Center54 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Shenandoah
Clinicians with the same Medicare primary specialty in Shenandoah, IA — not a recommendation.
Other clinicians in Shenandoah Medical Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2009 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659604403 |
| 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
- 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