Quick answers
- Which hospitals does Gregory Mathelier work at?
- Medicare's official clinician data lists Gregory Mathelier at 1 hospital: Frederick Health Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory Mathelier see patients?
- Medicare's clinician data lists 1 practice location in Frederick, MD. Call before your visit to confirm the address.
- What is Gregory Mathelier's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Gregory Mathelier accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory Mathelier 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 Gregory Mathelier?
- (840) 566-3300, as listed in official Medicare / NPI Registry data.
- What is Gregory Mathelier's NPI number?
- 1386227577. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory Mathelier works
Medicare's Facility Affiliation Data lists Gregory Mathelier at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Frederick Health HospitalFrederick, MD · Acute Care Hospital · CCN 210005
Practice locations
Addresses where Gregory Mathelier is enrolled with Medicare (CMS data updated 2026-10-02).
- 400 W 7th St, Frederick Health HospitalFrederick, MD 21701 (840) 566‑3300
Group practices
Medicare enrollment lists Gregory Mathelier as a member of this group (CMS data updated 2026-10-02).
- Hospitalist Medicine Physicians of Maryland-Frederick PC12 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Frederick
Clinicians with the same Medicare primary specialty in Frederick, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Howard University College Of Medicine |
| Graduation year | 2021 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1386227577 |
| 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