Quick answers
- Does Madison M. Messmer accept Medicare assignment?
- Medicare's clinician data says Madison M. Messmer may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- What is Madison M. Messmer's NPI number?
- 1164125571. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Madison M. Messmer works
Medicare's Facility Affiliation Data lists Madison M. Messmer 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.
- Legacy Meridian Park Medical CenterTualatin, OR · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 380089
Practice locations
Addresses where Madison M. Messmer is enrolled with Medicare (CMS data updated October 2, 2026).
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Portland
Clinicians with the same Medicare primary specialty in Portland, OR — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | New York Medical College |
| Graduation year | 2022 (4 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1164125571 |
| 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