William Butler, MD
NPI 1588709877 · Allergy & Immunology Physician · Seattle, WA
Enrolled with Medicare as Practitioner - Allergy/Immunology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Butler, MD is a Allergy & Immunology Physician provider in Seattle, WA (NPI 1588709877).
Provider details
- NPI number
- 1588709877
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD00036622 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone Propion/Salmeterolbrand: Wixela Inhub | 44 | — |
| Budesonide/Formoterol Fumaratebrand: Breyna | 25 | — |
| Azelastine Hcl | 14 | — |
| Dupilumabbrand: Dupixent Pen | 13 | — |
| Epinephrine | 13 | 11 |
| Famotidine | 13 | — |
| Ciclesonidebrand: Alvesco | 11 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-21
- Last updated
- 2021-05-19
- Certified
- 2021-05-19
Frequently asked questions
- What is William Butler's NPI number?
- William Butler's National Provider Identifier (NPI) is 1588709877, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Butler's specialty?
- William Butler is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is William Butler located?
- William Butler's practice location on file with NPPES is 125 16th Ave E, Seattle, WA 98112-5211.
- What is William Butler's phone number?
- The practice phone number listed in the NPPES registry for William Butler is (206) 326-3000.
- Does William Butler accept Medicare?
- William Butler is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Butler's NPI active?
- Yes — William Butler's NPI (1588709877) is active in the NPPES registry as of the last update on 2021-05-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.