Mark Duncan, MD
Family Medicine Physician · Freeland, WA
Mark Duncan, MD is a family medicine physician with a practice address in Freeland, Washington, and NPI 1598713919, issued on May 5, 2006. Check the license (Washington 60305379, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Mark Duncan
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 60305379 WA
045063 GA
Self-reported in NPPES; status is on the state search - Practice location
- 5577 Vanbarr PL, Freeland, WA 98249
- Phone
- (360) 331-3343
- Enumerated
- May 5, 2006
- Record last updated
- Apr 25, 2023
- Medicare enrollment
- Enrolled (PECOS I20130423000330); accepts Medicare assignment
- Medical or professional school
- West Virginia University School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 5,534 in Washington → Look up another NPI →
Also registered at 5577 Vanbarr PL
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Duncan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license 60305379Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% fewer Medicare Part D claims than the average family medicine physician in 2024
970 Medicare Part D claims for 260 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 33 claims were for opioids.
Most prescribed
- Atorvastatin Calcium94 claims
- Lisinopril48 claims
- Amlodipine Besylate44 claims
- Losartan Potassium40 claims
- Metformin Hcl38 claims
- Omeprazole37 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 practice group's MIPS final score for 2023 (Medicare payment program): 88.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Oak Harbor Primary Care PLLCOak Harbor, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Duncan among 5,534 family medicine physician records in Washington
Mark Duncan, MD is one of 5,534 family medicine physician records with a practice address in Washington. 73% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 58% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1995 · median 2009 among the 3,294 with a school on file
- Record last updated2023 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 family medicine physician records list a practice address in Freeland
They are 3 of the 94 NPPES records with a practice address in Freeland, and 5,534 family medicine physician records in Washington.
All 5,534 in Washington → Every provider in Freeland → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Debra Caswell, MS, PA-CFreeland, WA 982491215071808
- William Wien, DOFreeland, WA 982491407838949
- Jennifer Bates, MDFerndale, WA 982481417993148
- Tara Berry, D.O.Ferndale, WA 982481992167977
- Rachel Bishop, M.D.Friday Harbor, WA 982501043369044
- Samuel Browning, DOFerndale, WA 982481942440052
- Christopher Covert-Bowlds, MDFerndale, WA 982481346312600
- Ruth Fothergill, M.D,Friday Harbor, WA 982501316009178
Common questions
What is Mark Duncan, MD's NPI number?
Mark Duncan, MD's National Provider Identifier (NPI) is 1598713919, issued on May 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Duncan, MD located?
The NPPES record lists a practice address at 5577 Vanbarr PL, Freeland, WA, 98249. Phone: (360) 331-3343. Providers update this record themselves, so call before visiting.
How can I verify Mark Duncan, MD's license?
NPPES lists Washington license number 60305379, 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 Mark Duncan, MD prescribe under Medicare Part D?
In 2024, Mark Duncan, MD had 970 Medicare Part D claims for 260 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Mark Duncan, MD's MIPS final score?
The 2023 MIPS final score is 88.2 of 100, reported for the practice group. 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.