Christopher Loiselle, M.D.
NPI 1225259187 · Radiation Oncology Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christopher Loiselle, M.D. is a Radiation Oncology Physician provider in Seattle, WA (NPI 1225259187).
Provider details
- NPI number
- 1225259187
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD60101794 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,784 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Calculation of Radiation Therapy Dose77300 | 774 | $35 |
| Design and Construction of Complex Radiation Treatment Device77334 | 352 | $64 |
| 3d Radiation Therapy Planning77295 | 90 | $240 |
| Complex Radiation Therapy Planning77263 | 81 | $179 |
| Special Radiation Treatment77470 | 70 | $114 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 69 | $102 |
| Obtaining Data Needed to Develop the Optimal Radiation Treatment, 3 Or More Treatment Areas Or Any Number of Treatment Areas Where Special Treatment Is Involved |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Dexamethasone | 13 | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$8,377 across 18 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 550 17th Ave Ste A10Seattle, WA 98122-5789Phone: (206) 320-7130Fax: (206) 320-7137
Registry dates
- Enumerated
- 2007-05-01
- Last updated
- 2021-05-24
- Certified
- 2021-05-24
Frequently asked questions
- What is Christopher Loiselle's NPI number?
- Christopher Loiselle's National Provider Identifier (NPI) is 1225259187, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christopher Loiselle's specialty?
- Christopher Loiselle is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Christopher Loiselle located?
- Christopher Loiselle's practice location on file with NPPES is 1221 Madison St, Seattle, WA 98104-3589.
- What is Christopher Loiselle's phone number?
- The practice phone number listed in the NPPES registry for Christopher Loiselle is (206) 386-2323.
- Does Christopher Loiselle accept Medicare?
- Christopher Loiselle is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christopher Loiselle's NPI active?
- Yes — Christopher Loiselle's NPI (1225259187) is active in the NPPES registry as of the last update on 2021-05-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.