Quick answers
- Which hospitals does Peter G. Mavrelis work at?
- Medicare's official clinician data lists Peter G. Mavrelis at 1 hospital: Methodist Hospitals Inc. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Peter G. Mavrelis see patients?
- Medicare's clinician data lists 1 practice location in Merrillville, IN. Call before your visit to confirm the address.
- What is Peter G. Mavrelis's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Peter G. Mavrelis accept Medicare assignment?
- Yes. Medicare's clinician data says Peter G. Mavrelis 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 Peter G. Mavrelis?
- (219) 738-5617, as listed in official Medicare / NPI Registry data.
- What is Peter G. Mavrelis's NPI number?
- 1326043597. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Peter G. Mavrelis works
Medicare's Facility Affiliation Data lists Peter G. Mavrelis at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Methodist Hospitals IncGary, IN · Acute Care Hospital · CCN 150002
Practice locations
Addresses where Peter G. Mavrelis is enrolled with Medicare (CMS data updated 2026-10-02).
- 101 E 87th Ave, 430 Methodist Surgical ServicesMerrillville, IN 46410 (219) 738‑5617
Group practices
Medicare enrollment lists Peter G. Mavrelis as a member of this group (CMS data updated 2026-10-02).
- The Methodist Hospitals Inc129 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Merrillville
Clinicians with the same Medicare primary specialty in Merrillville, IN — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Chicago, Pritzker School Of Medicine |
| Graduation year | 1972 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1326043597 |
| 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