Christopher Tretter, MD
NPI 1083648133 · Hematology & Oncology Physician · South Portland, ME
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christopher Tretter, MD is a Hematology & Oncology Physician provider in South Portland, ME (NPI 1083648133).
Provider details
- NPI number
- 1083648133
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 234273 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
321 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 249 | $96 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 38 | $173 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 34 | $141 |
Typical Medicare-allowed amounts for these services range $96–$173 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 133 | 36 |
| Abiraterone Acetate | 113 | 24 |
| Prochlorperazine Maleate | 55 | 44 |
| Ondansetron Hcl | 27 | 22 |
| Enzalutamidebrand: Xtandi | 20 | — |
| Potassium Chloride | 16 | — |
| Levothyroxine Sodium | 15 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-11
- Last updated
- 2023-11-15
- Certified
- 2023-11-13
Frequently asked questions
- What is Christopher Tretter's NPI number?
- Christopher Tretter's National Provider Identifier (NPI) is 1083648133, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christopher Tretter's specialty?
- Christopher Tretter is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Christopher Tretter located?
- Christopher Tretter's practice location on file with NPPES is Mainehealth Cancer Care, South Portland, ME 04106.
- What is Christopher Tretter's phone number?
- The practice phone number listed in the NPPES registry for Christopher Tretter is (207) 661-0200.
- Does Christopher Tretter accept Medicare?
- Christopher Tretter is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christopher Tretter's NPI active?
- Yes — Christopher Tretter's NPI (1083648133) is active in the NPPES registry as of the last update on 2023-11-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.