William Rayford Gwin, MD
Medical Oncology Physician · Seattle, WA
William Rayford Gwin, MD is a medical oncology physician with a practice address in Seattle, Washington, and NPI 1598875882, issued on Aug 30, 2006. Check the license (Washington MD60094874, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- William Rayford Gwin
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- MD60094874 WA
Self-reported in NPPES; status is on the state search - Practice location
- 325 9TH Ave, Seattle, WA 98104
- Phone
- (206) 744-5100
- Enumerated
- Aug 30, 2006
- Record last updated
- Oct 28, 2016 (not updated in 10 years: call before relying on the address or phone)
- Medicaid ID
- 1598875882 WA
- Medicare enrollment
- Enrolled (PECOS I20090818000720); accepts Medicare assignment
- Medical or professional school
- University Of Alabama School Of Medicine, 2006
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 183 in Washington → Look up another NPI →
Also registered at 325 9TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Martin Abdo, COUNSELORCounselor1821202904
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Verify William Rayford Gwin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD60094874Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average medical oncology physician in 2024
214 Medicare Part D claims for 44 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims. 12 claims were for opioids.
Most prescribed
- Letrozole43 claims
- Anastrozole19 claims
- Tamoxifen Citrate18 claims
- Kisqali15 claims
- Ibrance14 claims
- Ondansetron Hcl12 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.
The MIPS final score for 2023 (Medicare payment program): 83.8 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,438.48
8 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 3,343 providers of this specialty with any payment received $11,773.47 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- The Association OF University PhysiciansSeattle, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Rayford Gwin among 183 medical oncology physician records in Washington
William Rayford Gwin, MD is one of 183 medical oncology physician records with a practice address in Washington. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 40% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 61% of these records are
- Graduated2006 · median 1998 among the 112 with a school on file
- Record last updated2016 · 70% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Washington
There are 183 medical oncology physician records in Washington.
All 183 in Washington → Every provider in Seattle → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Thomas Brown, M.D.Seattle, WA 981041992880991
- Siddhartha Devarakonda, MDSeattle, WA 981041487932398
- Albert Einstein, MDSeattle, WA 981041558444588
- Erin Ellis, MDSeattle, WA 981041447334164
- Rafic Farah, MDSeattle, WA 981041780760587
- Mehmet Fer, MDSeattle, WA 981041164506887
- Mark FrohlichSeattle, WA 981041366528168
- Philip Gold, MDSeattle, WA 981041265516983
Common questions
What is William Rayford Gwin, MD's NPI number?
William Rayford Gwin, MD's National Provider Identifier (NPI) is 1598875882, issued on Aug 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William Rayford Gwin, MD located?
The NPPES record lists a practice address at 325 9TH Ave, Seattle, WA, 98104. Phone: (206) 744-5100. Providers update this record themselves, so call before visiting.
How can I verify William Rayford Gwin, MD's license?
NPPES lists Washington license number MD60094874, 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 Rayford Gwin, MD prescribe under Medicare Part D?
In 2024, William Rayford Gwin, MD had 214 Medicare Part D claims for 44 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.
What is William Rayford Gwin, MD's MIPS final score?
The 2023 MIPS final score is 83.8 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.