Quick answers
- Which hospitals does Matthew S. Massmann work at?
- Medicare's official clinician data lists Matthew S. Massmann at 3 hospitals: Essentia Health Ada, Riverview Hospital and Unity Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Matthew S. Massmann see patients?
- Medicare's clinician data lists 3 practice locations, including Grafton, ND and Ada, MN. Call before your visit to confirm the address.
- What is Matthew S. Massmann's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Matthew S. Massmann accept Medicare assignment?
- Yes. Medicare's clinician data says Matthew S. Massmann 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 Matthew S. Massmann?
- (701) 352-1620, as listed in official Medicare / NPI Registry data.
- What is Matthew S. Massmann's NPI number?
- 1215292750. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Matthew S. Massmann works
Medicare's Facility Affiliation Data lists Matthew S. Massmann at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Essentia Health AdaAda, MN · Critical Access Hospital · CCN 241313
- Riverview HospitalCrookston, MN · Critical Access Hospital · CCN 241320
- Unity Medical CenterGrafton, ND · Critical Access Hospital · CCN 351320
Practice locations
Addresses where Matthew S. Massmann is enrolled with Medicare (CMS data updated 2026-10-02).
- 164 W 13th StGrafton, ND 58237 (701) 352‑1620
- 201 9th St WAda, MN 56510 (218) 784‑5000
- 201 9th St W, 2 Benedictine Living Community of AdaAda, MN 56510 (218) 784‑5500
Group practices
Medicare enrollment lists Matthew S. Massmann as a member of these groups (CMS data updated 2026-10-02).
- Christian Unity Hospital Corporation24 clinicians in the group
- Bridges Medical Center22 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Grafton
Clinicians with the same Medicare primary specialty in Grafton, ND — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2012 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1215292750 |
| 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