Effie Petersdorf, MD
NPI 1255532453 · Hematology & Oncology Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Effie Petersdorf, MD is a Hematology & Oncology Physician provider in Seattle, WA (NPI 1255532453).
Provider details
- NPI number
- 1255532453
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- MD00020961 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-29
- Last updated
- 2007-07-09
Frequently asked questions
- What is Effie Petersdorf's NPI number?
- Effie Petersdorf's National Provider Identifier (NPI) is 1255532453, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Effie Petersdorf's specialty?
- Effie Petersdorf is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Effie Petersdorf located?
- Effie Petersdorf's practice location on file with NPPES is 825 Eastlake Ave E, Seattle, WA 98109-4405.
- What is Effie Petersdorf's phone number?
- The practice phone number listed in the NPPES registry for Effie Petersdorf is (206) 288-1000.
- Does Effie Petersdorf accept Medicare?
- Effie Petersdorf is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Effie Petersdorf's NPI active?
- Yes — Effie Petersdorf's NPI (1255532453) is active in the NPPES registry as of the last update on 2007-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.