Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Gregory P Duff, MD

Individual provider Orthopaedic Surgery Physician · NPI 1952374290

Gregory P Duff, MD practises Orthopedic Surgery in Silverdale, Washington. Graduated from Harvard Medical School in 1992, 34 years ago. Practices with Franciscan Medical Group, a 1,417-clinician group and accepts Medicare assignment. Licensed in Washington.

Years since qualifying
34
Trained at
Harvard Medical School
Licensed in
WA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

4409 NW Anderson Hill Rd
Silverdale, WA 98383-6807
Phone: (360) 698-6630
Fax: (360) 825-6536
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Orthopaedic Surgery Physician (primary) Taxonomy 207X00000X · Licence MD00034439 (WA)

Record details

NPI number1952374290
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedFebruary 8, 2006
Last updated in NPPESDecember 2, 2020
Certification dateDecember 2, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyORTHOPEDIC SURGERY
Also practisesSPORTS MEDICINE
Medical schoolHARVARD MEDICAL SCHOOL
Graduated 1992 (34 years in practice)
Group practice Franciscan Medical Group — 1417 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Upper limb (arm) arthroscopy (minimally invasive joint repair) 21 times · 64th percentile
Lower limb (leg) arthroscopy (minimally invasive joint repair) 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients239
Services billed 1,245 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Franciscan Medical Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1417 clinicians in the practice; 12 are shown here.

Other providers in Silverdale