Quick answers
- Which hospitals does Matthew C. Riesen work at?
- Medicare's official clinician data lists Matthew C. Riesen at 5 hospitals: Grand Lake Health System, Lima Memorial Health System, Mercer County Joint Township Community Hospital, Mercy Health St Ritas Medical Center and Wilson Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Matthew C. Riesen see patients?
- Medicare's clinician data lists 3 practice locations, including Saint Marys, OH, Coldwater, OH and Celina, OH. Call before your visit to confirm the address.
- What is Matthew C. Riesen's specialty?
- Medicare lists General Practice as the primary specialty.
- Does Matthew C. Riesen accept Medicare assignment?
- Yes. Medicare's clinician data says Matthew C. Riesen 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 C. Riesen?
- (419) 394-5851, as listed in official Medicare / NPI Registry data.
- What is Matthew C. Riesen's NPI number?
- 1497947998. 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 C. Riesen works
Medicare's Facility Affiliation Data lists Matthew C. Riesen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Grand Lake Health SystemSaint Marys, OH · Acute Care Hospital · CCN 360032
- Lima Memorial Health SystemLima, OH · Acute Care Hospital · CCN 360009
- Mercer County Joint Township Community HospitalColdwater, OH · Acute Care Hospital · CCN 360058
- Mercy Health St Ritas Medical CenterLima, OH · Acute Care Hospital · CCN 360066
- Wilson Memorial HospitalSidney, OH · Acute Care Hospital · CCN 360013
Practice locations
Addresses where Matthew C. Riesen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1132 Hager StSaint Marys, OH 45885 (419) 394‑5851
- 800 W Main StColdwater, OH 45828 (419) 678‑2341
- 950 S Main StCelina, OH 45822 (419) 586‑1611
Group practices
Medicare enrollment lists Matthew C. Riesen as a member of this group (CMS data updated 2026-10-02).
- Mercer County Joint Township Community Hospital61 clinicians in the group
Specialties
- General Practiceprimary
Other general practitioners in Ohio
Clinicians with the same Medicare primary specialty in Ohio — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Toledo Medical College |
| Graduation year | 2007 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1497947998 |
| 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