Quick answers
- Which hospitals does Christopher G. Tretter work at?
- Medicare's official clinician data lists Christopher G. Tretter at 4 hospitals: Beth Israel Deaconess Medical Center, MaineHealth Maine Medical Center, MaineHealth Stephens Hospital and The Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Christopher G. Tretter see patients?
- Medicare's clinician data lists 3 practice locations, including Scarborough, ME, Portland, ME and South Portland, ME. Call before your visit to confirm the address.
- What is Christopher G. Tretter's specialty?
- Medicare lists Medical Oncology as the primary specialty, and also Internal Medicine.
- Does Christopher G. Tretter accept Medicare assignment?
- Yes. Medicare's clinician data says Christopher G. Tretter 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.
- Does Christopher G. Tretter offer telehealth?
- Medicare's clinician data says Christopher G. Tretter offers telehealth services. Ask the office which visits can be done by video or phone.
- What is Christopher G. Tretter's NPI number?
- 1083648133. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Christopher G. Tretter works
Medicare's Facility Affiliation Data lists Christopher G. Tretter at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · CCN 220086
- MaineHealth Maine Medical CenterPortland, ME · Acute Care Hospital · CCN 200009
- MaineHealth Stephens HospitalNorway, ME · Critical Access Hospital · CCN 201315
- The Memorial HospitalNorth Conway, NH · Critical Access Hospital · CCN 301307
Practice locations
Addresses where Christopher G. Tretter is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Campus DrScarborough, ME 04074
- 22 Bramhall StPortland, ME 04102
- 265 Western Ave, Suite 2South Portland, ME 04106
Group practices
Medicare enrollment lists Christopher G. Tretter as a member of this group (CMS data updated 2026-10-02).
- MaineHealth2,633 clinicians in the group
Specialties
- Medical Oncologyprimary
- Internal Medicinealso
Other oncologists in Scarborough
Clinicians with the same Medicare primary specialty in Scarborough, ME — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | McGill University, Faculty Of Medicine |
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1083648133 |
| 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