Quick answers
- Which hospitals does Mark R. Riser work at?
- Medicare's official clinician data lists Mark R. Riser at 2 hospitals: Aspirus Merrill Hospital and Landmark Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark R. Riser see patients?
- Medicare's clinician data lists 3 practice locations, including Woonsocket, RI, Rhinelander, WI and Tomahawk, WI. Call before your visit to confirm the address.
- What is Mark R. Riser's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Mark R. Riser accept Medicare assignment?
- Yes. Medicare's clinician data says Mark R. Riser 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 Mark R. Riser?
- (401) 469-4100, as listed in official Medicare / NPI Registry data.
- What is Mark R. Riser's NPI number?
- 1457309619. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark R. Riser works
Medicare's Facility Affiliation Data lists Mark R. Riser at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Aspirus Merrill HospitalMerrill, WI · Critical Access Hospital · CCN 521339
- Landmark Medical CenterWoonsocket, RI · Acute Care Hospital · CCN 410011
Practice locations
Addresses where Mark R. Riser is enrolled with Medicare (CMS data updated 2026-10-02).
- 115 Cass AveWoonsocket, RI 02895 (401) 469‑4100
- 2251 N Shore Dr, Suite 200Rhinelander, WI 54501 (715) 361‑2000
- 401 W Mohawk Dr, Suite 100Tomahawk, WI 54487 (715) 361‑2000
Group practices
Medicare enrollment lists Mark R. Riser as a member of these groups (CMS data updated 2026-10-02).
- Aspirus Rhinelander and Tomahawk Hospitals and Clinics, Inc.574 clinicians in the group
- Emergency Associates of Woonsocket LLC22 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Woonsocket
Clinicians with the same Medicare primary specialty in Woonsocket, RI — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Kansas City University Of Med & Biosciences, College Of Osteo Med |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1457309619 |
| 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