Gregory P. Duff, M.D.
Orthopaedic Surgery Physician · Silverdale, WA
Gregory P. Duff, M.D. is an orthopaedic surgery physician with a practice address in Silverdale, Washington, and NPI 1952374290, issued on Feb 8, 2006. Check the license (Washington MD00034439, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Gregory P. Duff
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- MD00034439 WA
Self-reported in NPPES; status is on the state search - Practice location
- 4409 NW Anderson Hill RD, Silverdale, WA 98383
- Phone
- (360) 698-6630
- Enumerated
- Feb 8, 2006
- Record last updated
- Dec 2, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (360) 825-6536
- Medicaid IDs
- 1105137 WA
1023009 WA - Medicare enrollment
- Enrolled (PECOS I20040303000622); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 1992
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 656 in Washington → Look up another NPI →
Also registered at 4409 NW Anderson Hill RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Omar Abdul-Hadi, MDOrthopaedic Surgery of the Spine Physician1073715546
- James Allen, PA-CPhysician Assistant1952392102
- Dawson Brown, M.D.Orthopaedic Surgery Physician1588867394
- Laura Cobb, PA-CMedical Physician Assistant1407258965
- Nonette Gepitulan, PT, DPTOrthopedic Physical Therapist1912567801
- Kristin Groessl, PA-CSurgical Physician Assistant1093797250
Verify Gregory P. Duff in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license MD00034439Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
263 Medicare Part D claims for 85 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. 89 claims were for opioids.
Most prescribed
- Oxycodone-Acetaminophen73 claims
- Cephalexin57 claims
- Ondansetron Odt49 claims
- Ibuprofen35 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
- Franciscan Medical GroupSilverdale, WA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory P. Duff among 656 orthopaedic surgery physician records in Washington
Gregory P. Duff, M.D. is one of 656 orthopaedic surgery physician records with a practice address in Washington. 67% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 46% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1992 · median 2004 among the 385 with a school on file
- Record last updated2020 · 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 207X00000X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Orthopaedic Surgery Physician providers in Washington
There are 656 orthopaedic surgery physician records in Washington.
All 656 in Washington → Every provider in Silverdale → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Stanley Bigos, M.D.Silverdale, WA 983831710150586
- Dawson Brown, M.D.Silverdale, WA 983831588867394
- Michael Henry, MDSilverdale, WA 983831558685198
- Stacee Kessinger, M.D.Silverdale, WA 983831326223009
- Kenneth Koskella, M.D.Silverdale, WA 983831164495495
- Erin Moyer, MDSilverdale, WA 983831992947592
- Christopher Rankin, M.D.Silverdale, WA 983831952333916
- Bradley Watters, M.D.Silverdale, WA 983831417987090
Common questions
What is Gregory P. Duff, M.D.'s NPI number?
Gregory P. Duff, M.D.'s National Provider Identifier (NPI) is 1952374290, issued on Feb 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory P. Duff, M.D. located?
The NPPES record lists a practice address at 4409 NW Anderson Hill RD, Silverdale, WA, 98383. Phone: (360) 698-6630. Providers update this record themselves, so call before visiting.
How can I verify Gregory P. Duff, M.D.'s license?
NPPES lists Washington license number MD00034439, 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 Gregory P. Duff, M.D. prescribe under Medicare Part D?
In 2024, Gregory P. Duff, M.D. had 263 Medicare Part D claims for 85 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. 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.