Christopher G. Tretter, MD
Hematology & Oncology Physician · South Portland, ME
Christopher G. Tretter, MD is a hematology & oncology physician with a practice address in South Portland, Maine, and NPI 1083648133, issued on Jul 11, 2006. Check the license (Maine 27471, as entered in NPPES) on the Maine Board of Licensure in Medicine; the Medicare figures below come from public CMS files.
- Name
- Christopher G. Tretter
- Credential
- MD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License numbers
- 27471 ME
234273 MA
Self-reported in NPPES; status is on the state search - Practice location
- Mainehealth Cancer Care, South Portland, ME 04106
- Phone
- (207) 661-0200
- Enumerated
- Jul 11, 2006
- Record last updated
- Nov 15, 2023
- Medicaid IDs
- 30200880 NH
110077681A MA - Medicare enrollment
- Enrolled (PECOS I20231211001681); accepts Medicare assignment
- Medical or professional school
- Mcgill University, Faculty Of Medicine, 1994
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 77 in Maine → Look up another NPI →
Verify Christopher G. Tretter in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaine Board of Licensure in Medicine
Search for license 27471Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
565 Medicare Part D claims for 112 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 22 claims were for opioids.
Most prescribed
- Prednisone133 claims
- Abiraterone Acetate113 claims
- Prochlorperazine Maleate55 claims
- Ondansetron Hcl27 claims
- Xtandi20 claims
- Potassium Chloride16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 91.4 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- MainehealthScarborough, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Christopher G. Tretter among 77 hematology & oncology physician records in Maine
Christopher G. Tretter, MD is one of 77 hematology & oncology physician records with a practice address in Maine. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 60% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1994 · median 2006 among the 53 with a school on file
- Record last updated2023 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a Maine practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 hematology & oncology physician records list a practice address in South Portland
They are 12 of the 1,143 NPPES records with a practice address in South Portland, and 77 hematology & oncology physician records in Maine.
All 77 in Maine → Every provider in South Portland → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Jason Adler, MDSouth Portland, ME 041061194252148
- Michael Auster, DOSouth Portland, ME 041061164929451
- Brian Cuzzo, MDSouth Portland, ME 041061548828080
- Pamela Egan, M.D.South Portland, ME 041061073874509
- Judit Gellen, M.D.South Portland, ME 041061407817406
- Xiao Hu, MDSouth Portland, ME 041061346731957
- Sarah Ketchum, M.D.South Portland, ME 041061689781536
- Ann Kim, MDSouth Portland, ME 041061457970436
Common questions
What is Christopher G. Tretter, MD's NPI number?
Christopher G. Tretter, MD's National Provider Identifier (NPI) is 1083648133, issued on Jul 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Christopher G. Tretter, MD located?
The NPPES record lists a practice address at Mainehealth Cancer Care, South Portland, ME, 04106. Phone: (207) 661-0200. Providers update this record themselves, so call before visiting.
How can I verify Christopher G. Tretter, MD's license?
NPPES lists Maine license number 27471, as entered by the provider. Search the Maine Board of Licensure in Medicine at https://www.maine.gov/md/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Christopher G. Tretter, MD prescribe under Medicare Part D?
In 2024, Christopher G. Tretter, MD had 565 Medicare Part D claims for 112 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Christopher G. Tretter, MD's MIPS final score?
The 2023 MIPS final score is 91.4 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.