Quick answers
- Does Mary J. Oyen accept Medicare assignment?
- Yes. Medicare's clinician data says Mary J. Oyen 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 J. Oyen's NPI number?
- 1770536161. 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 J. Oyen works
Medicare's Facility Affiliation Data lists Mary J. Oyen 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.
- Southwest Health CenterPlatteville, WI · Critical Access Hospital · Emergency services: listed by Medicare · CCN 521354
Practice locations
Addresses where Mary J. Oyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 133 Performance DrDarlington, WI 53530 (608) 776‑4413
- 1400 Eastside RdPlatteville, WI 53818
- 1450 Eastside RdPlatteville, WI 53818 (608) 348‑4330
Group practices
Medicare enrollment lists Mary J. Oyen as a member of this group (CMS data updated October 2, 2026).
- Southwest Health Center Inc114 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Other clinicians in Southwest Health Center Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Wisconsin School Of Medicine |
| Graduation year | 1993 (33 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1770536161 |
| 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