William B. Gunderson, MD
Internal Medicine Physician · Friday Harbor, WA
William B. Gunderson, MD is an internal medicine physician with a practice address in Friday Harbor, Washington, and NPI 1205151990, issued on Apr 6, 2010. Check the license (Washington MD60476325, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- William B. Gunderson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD60476325 WA
Self-reported in NPPES; status is on the state search - Practice location
- 1117 Spring St, Friday Harbor, WA 98250
- Phone
- (360) 378-2141
- Enumerated
- Apr 6, 2010
- Record last updated
- Jul 30, 2024
- Fax
- (360) 378-1785
- Medicare enrollment
- Enrolled (PECOS I20140910002173); accepts Medicare assignment
- Medical or professional school
- Tulane University School Of Medicine, 2010
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,079 in Washington → Look up another NPI →
Also registered at 1117 Spring St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William B. Gunderson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD60476325Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average internal medicine physician in 2024
7,116 Medicare Part D claims for 665 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 157 claims were for opioids.
Most prescribed
- Atorvastatin Calcium620 claims
- Lisinopril376 claims
- Tamsulosin Hcl272 claims
- Omeprazole241 claims
- Amlodipine Besylate221 claims
- Metoprolol Succinate192 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.
Bills Medicare through one group practice
- PeacehealthFriday Harbor, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William B. Gunderson among 3,079 internal medicine physician records in Washington
William B. Gunderson, MD is one of 3,079 internal medicine physician records with a practice address in Washington. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 62% of them.
- NPI issued2010 · 62% of these records are older, 35% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2010 · median 2006 among the 1,852 with a school on file
- Record last updated2024 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2 internal medicine physician records list a practice address in Friday Harbor
They are 2 of the 152 NPPES records with a practice address in Friday Harbor, and 3,079 internal medicine physician records in Washington.
All 3,079 in Washington → Every provider in Friday Harbor → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Regina Dwyer, M.D.Friday Harbor, WA 982501588873137
- Ann Cutcher, M.D.Freeland, WA 982491619167715
- Steven Musto, M.D.Freeland, WA 982491497900419
- Sally Stansfield, M.D.Freeland, WA 982491518335413
- Susan Slaughter-Jones, MDFerndale, WA 982481346206265
- Diane Staves, M.D.Everson, WA 982471669521704
- Glen Weller, M.D.Eastsound, WA 982451932250875
- Bennett Pafford, M.D.La Conner, WA 982571255568366
Common questions
What is William B. Gunderson, MD's NPI number?
William B. Gunderson, MD's National Provider Identifier (NPI) is 1205151990, issued on Apr 6, 2010. An NPI identifies a provider in billing; it is not a license.
Where is William B. Gunderson, MD located?
The NPPES record lists a practice address at 1117 Spring St, Friday Harbor, WA, 98250. Phone: (360) 378-2141. Providers update this record themselves, so call before visiting.
How can I verify William B. Gunderson, MD's license?
NPPES lists Washington license number MD60476325, 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 B. Gunderson, MD prescribe under Medicare Part D?
In 2024, William B. Gunderson, MD had 7,116 Medicare Part D claims for 665 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.