William K. Butler, MD
Allergy & Immunology Physician · Seattle, WA
William K. Butler, MD is an allergy & immunology physician with a practice address in Seattle, Washington, and NPI 1588709877, issued on Feb 21, 2007. Check the license (Washington MD00036622, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- William K. Butler
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- MD00036622 WA
Self-reported in NPPES; status is on the state search - Practice location
- 125 16TH Ave E, Seattle, WA 98112
- Phone
- (206) 326-3000
- Enumerated
- Feb 21, 2007
- Record last updated
- May 19, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 8243354 WA
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 90 in Washington → Look up another NPI →
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William K. Butler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00036622Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
75% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
183 Medicare Part D claims for 45 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 30% of claims.
Most prescribed
- Wixela Inhub44 claims
- Breyna25 claims
- Azelastine Hcl14 claims
- Dupixent Pen13 claims
- Epinephrine13 claims
- Famotidine13 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.
William K. Butler among 90 allergy & immunology physician records in Washington
William K. Butler, MD is one of 90 allergy & immunology physician records with a practice address in Washington. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 60% of them.
- NPI issued2007 · 60% of these records are older, 31% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 51% of these records are
- Record last updated2021 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207K00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in Washington
There are 90 allergy & immunology physician records in Washington.
All 90 in Washington → Every provider in Seattle → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Timothy Baltz, M.D.Seattle, WA 981121154471068
- Margaret Strub, MDSeattle, WA 981121528146123
- Leonard Altman, M.D.Seattle, WA 981151407892466
- Ashley Jerath Tatum, M.D.Seattle, WA 981151174559686
- Bani Preet Kaur, M.D.Seattle, WA 981151346544392
- Mary Lasley, M.D.Seattle, WA 981151396787925
- Audrey Park, MD,PH.DSeattle, WA 981151902016314
- Jay Sprenger, M.D.Seattle, WA 981151306893334
Common questions
What is William K. Butler, MD's NPI number?
William K. Butler, MD's National Provider Identifier (NPI) is 1588709877, issued on Feb 21, 2007. An NPI identifies a provider in billing; it is not a license.
Where is William K. Butler, MD located?
The NPPES record lists a practice address at 125 16TH Ave E, Seattle, WA, 98112. Phone: (206) 326-3000. Providers update this record themselves, so call before visiting.
How can I verify William K. Butler, MD's license?
NPPES lists Washington license number MD00036622, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William K. Butler, MD prescribe under Medicare Part D?
In 2024, William K. Butler, MD had 183 Medicare Part D claims for 45 beneficiaries; the average among allergy & immunology physician prescribers was 741. Part D covers Medicare prescriptions only.
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.