Dr Christopher G Tretter, MD - Medicare Medical Oncology in South Portland, ME

Dr Christopher G Tretter, MD is a medicare enrolled "Internal Medicine - Hematology & Oncology" physician in South Portland, Maine. He went to Mcgill University, Faculty Of Medicine and graduated in 1994 and has 30 years of diverse experience with area of expertise as Medical Oncology. He is a member of the group practice Mainehealth and his current practice location is Mainehealth Cancer Care, 265 Western Ave Suite 2, South Portland, Maine. You can reach out to his office (for appointments etc.) via phone at (207) 661-0200.

Dr Christopher G Tretter is licensed to practice in Maine (license number 27471) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1083648133.

Contact Information

Dr Christopher G Tretter, MD
Mainehealth Cancer Care, 265 Western Ave Suite 2,
South Portland, ME 04106
(207) 661-0200
Not Available

Map and Direction




Physician's Profile

Full NameDr Christopher G Tretter
GenderMale
SpecialityMedical Oncology
Experience30 Years
LocationMainehealth Cancer Care, South Portland, Maine
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Christopher G Tretter attended and graduated from Mcgill University, Faculty Of Medicine in 1994
  NPI Data:
  • NPI Number: 1083648133
  • Provider Enumeration Date: 07/11/2006
  • Last Update Date: 11/15/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 9739074048
  • Enrollment ID: I20231211001681

Medical Identifiers

Medical identifiers for Dr Christopher G Tretter such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1083648133NPI-NPPES
30200880MedicaidNH
110077681AMedicaidMA

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RH0003XInternal Medicine - Hematology & Oncology 234273 (Massachusetts)Secondary
207RH0003XInternal Medicine - Hematology & Oncology 27471 (Maine)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Lahey Hospital & Medical Center, BurlingtonBurlington, MAHospital
Maine Medical CenterPortland, MEHospital
Beth Israel Deaconess Medical CenterBoston, MAHospital
Southern Maine Health CareBiddeford, MEHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Mainehealth75178605882109

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Christopher G Tretter allows following entities to bill medicare on his behalf.
Entity NameMaine Medical Partners
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1285738310
PECOS PAC ID: 9335043967
Enrollment ID: O20040525000396
Entity NameMainehealth
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1790265502
PECOS PAC ID: 7517860588
Enrollment ID: O20040701000166

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Christopher G Tretter is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Christopher G Tretter, MD
Mainehealth Cancer Care, 265 Western Ave Suite 2,
South Portland, ME 04106

Ph: (207) 661-0200
Dr Christopher G Tretter, MD
Mainehealth Cancer Care, 265 Western Ave Suite 2,
South Portland, ME 04106

Ph: (207) 661-0200

Reviews and Comments


Internal Medicine Doctors in South Portland, ME

Dr. Jonathan B Zuckerman, M.D.
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 100 Foden Road, West Building Suite 103, South Portland, ME 04106
Phone: 207-828-1122    Fax: 207-828-0188
Laureen A Biczak, DO
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 50 Foden Rd, Ste 3, South Portland, ME 04106
Phone: 207-774-5816    Fax: 207-523-8594
Pamela Egan, M.D.
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 265 Western Ave Ste 2, South Portland, ME 04106
Phone: 207-661-0200    
Lucy Rosenbaum, M.D.
Hematology & Oncology
Medicare: Medicare Enrolled
Practice Location: 75 John Roberts Rd Bldg B, South Portland, ME 04106
Phone: 207-775-4151    
Dr. Emily V Wood, MD
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 50 Foden Rd, Ste 3, South Portland, ME 04106
Phone: 207-774-5816    Fax: 207-523-8594
Dr. Daniel J Diekema, MD
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 41 Donald B Dean Dr, South Portland, ME 04106
Phone: 207-661-7901    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

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