Dr. Gregory P. Duff, MD
- Medicare services, 2024
- 1,068
- Medicare patients, 2024
- 239
- Part D claims, 2024
- 263
- Hospital affiliations
- 2
- Industry payments
- $1,244
- Practice address
- 4409 NW Anderson Hill Rd, Silverdale, WA 98383
- Practice phone
- Call (253) 779-6100
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Franciscan Medical Group
Silverdale, Washington
Find Dr. Duff's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Gregory P. Duff is an orthopedic surgeon in Silverdale, Washington
Dr. Duff practices at Franciscan Medical Group in Silverdale, Washington.
Dr. Duff's NPI, 1952374290, was assigned on February 8, 2006. Dr. Duff graduated from Harvard Medical School in 1992. Dr. Duff holds Washington license MD00034439.
- NPI
- 1952374290NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3375438351
- NPI enumeration date
- February 8, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (253) 779-6100
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 60
- Medical school graduation
- 1992
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory P. Duff practices at Franciscan Medical Group in Silverdale, Washington
Dr. Duff's primary practice is Franciscan Medical Group, at 4409 NW Anderson Hill Rd, Silverdale, WA 98383 in Kitsap County. The practice phone is (253) 779-6100.
- Franciscan Medical Group4409 NW Anderson Hill Rd, Silverdale, WA 98383 · Kitsap CountyPhone(253) 779-6100
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gregory P. Duff is affiliated with 4 sites of care and 1 medical group
Dr. Duff's primary practice is Franciscan Medical Group in Silverdale, Washington. Dr. Duff is also affiliated with St. Michael Medical Center. The medical group on file is Franciscan Orthopedics - Silverdale. Dmand AI also links Dr. Duff to 1 more hospital and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gregory P. Duff's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Duff practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Franciscan Medical Group | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory P. Duff is one of 514 orthopedic surgeons in Washington
Orthopaedic surgery is Dr. Duff's primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Duff is licensed in Washington.
Specialties and state licenses
- Orthopaedic surgery, WashingtonPrimary
Orthopedic surgeons near Dr. Duff
Counts of orthopedic surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory P. Duff billed Medicare for 1,068 services in 2024
CMS data shows 1,068 Medicare services from Dr. Duff across 12 procedure codes in 2024, for 239 Medicare patients. Medicare paid $83,437 for them.
Dr. Duff's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3772024: 43114%
- Drugs given in the office
- 2023: 2412024: 34844%
- Imaging
- 2023: 2032024: 1935%
- Surgery
- 2023: 692024: 9639%
Where Dr. Duff's Medicare services took place, 2024
- In an office1,04398%
- In a facility252%
Dr. Duff compared with the Washington median for orthopedic surgeons, 2024
- Dr. Duff
- Washington median
- Medicare services
- 1,068vs 67059% above
- Medicare patients
- 239vs 21611% above
- Part D claims
- 214vs 822.6 times
Medians across 493 orthopedic surgeons in Washington with Dmand AI profiles that report each measure.
Dr. Duff's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Duff and other orthopedic surgeons in Washington.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory P. Duff treated 239 Medicare patients in 2024, average age 74
CMS counts 239 Medicare patients who saw Dr. Duff in 2024. The largest group is 65 to 74, with 116 patients. 72% of them have arthritis, and 66% have high blood pressure. 6% are also on Medicaid. Their average risk score is 1.00, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Duff's median patient age at 61, with 48% women.
Dr. Duff's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Duff's Medicare patients by sex, 2024
- Women11347%
- Men12653%
Chronic conditions among Dr. Duff's Medicare patients, 2024
- Arthritis72%
- High blood pressure66%
- High cholesterol64%
- Mood disorders23%
- Depression21%
- Ischemic heart disease21%
- Atrial fibrillation19%
- Diabetes19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Duff's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 61
Patient panel by sex, all payers
- Women48%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gregory P. Duff wrote 263 Medicare Part D claims in 2024
In 2024, Dr. Duff wrote 263 Medicare Part D claims for 85 patients. 99% of them were for generic drugs. CMS names the drug for 214 of them, across 4 drugs with 11 or more claims each, at $1,480 in total drug cost. In 2023, CMS named 209 claims across 4 drugs.
Dr. Duff's Part D claims by kind of drug, 2024
- Generic260 claims99%
- Brand-name and other3 claims1%
Dr. Duff's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Duff's Part D claims, 2024
- Opioids34%89 of 263 claims
- Antibiotics23%60 of 263 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2092024: 2142%
Drugs named by CMS: 4 in 2024, 4 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Gregory P. Duff ranks in the 63rd percentile for upper limb (arm) arthroscopy (minimally invasive joint repair) in Medicare
Dr. Duff accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 20 procedures of upper limb (arm) arthroscopy (minimally invasive joint repair) by Dr. Duff, more than 63% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Duff ranks in Medicare procedure volume
- Upper limb (arm) arthroscopy (minimally invasive joint repair)
- 63rd percentile20 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Lower limb (leg) arthroscopy (minimally invasive joint repair): 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Gregory P. Duff received $1,244 in industry payments from 2016 to 2021
CMS Open Payments shows 3 general payments to Dr. Duff from 3 drug and device companies from 2016 to 2021. Education make up the largest share, 96% of the total. Summit Surgical Corp. paid the most, $1,200.
General payments to Dr. Duff by program year, 2016 to 2021
General payments to Dr. Duff by kind, 2016 to 2021
- Education$1,20096%
- Food and beverage$292%
- Gifts$151%
Companies that paid Dr. Duff the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Gregory P. Duff graduated from Harvard Medical School
Dr. Duff graduated from Harvard Medical School in 1992.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory P. Duff's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Gregory P. Duff
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Gregory P. Duff's NPI number?
Dr. Gregory P. Duff's NPI number is 1952374290. It was assigned on February 8, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory P. Duff?
Dr. Gregory P. Duff is an orthopedic surgeon in Silverdale, Washington. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Gregory P. Duff practice?
Dr. Duff practices at 4409 NW Anderson Hill Rd, Silverdale, WA 98383. Dr. Duff's primary practice is Franciscan Medical Group in Silverdale, Washington. Dmand AI also links Dr. Duff to 1 hospital and 1 group practice or clinic.
What is Dr. Gregory P. Duff's office phone number?
The practice phone on file for Dr. Duff is (253) 779-6100.
What is Dr. Gregory P. Duff's medical license number?
Dr. Duff holds Washington license MD00034439.
Which hospitals is Dr. Gregory P. Duff affiliated with?
Dr. Duff is affiliated with St. Michael Medical Center. Dmand AI links Dr. Duff to 1 more hospital.
What medical group is Dr. Gregory P. Duff part of?
Dr. Duff is linked to Franciscan Orthopedics - Silverdale.
Does Dr. Gregory P. Duff accept Medicare?
Yes. CMS data shows Dr. Duff billed Medicare for 1,068 services in 2024, and Dr. Duff accepts Medicare assignment.
How many Medicare patients does Dr. Gregory P. Duff see?
CMS counts 239 Medicare patients who saw Dr. Duff in 2024, with an average age of 74.
What services does Dr. Gregory P. Duff bill to Medicare?
In 2024, Dr. Duff's most billed Medicare services were injected or infused drug (J3301), office visit, established patient (99214) and diagnostic imaging (73030).
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Where did Dr. Gregory P. Duff go to medical school?
Dr. Duff graduated from Harvard Medical School in 1992.
What drugs does Dr. Gregory P. Duff prescribe most?
In 2024 Medicare Part D data, Dr. Duff's most prescribed drugs by claims were Oxycodone-Acetaminophen, Cephalexin and Ondansetron ODT.
Has Dr. Gregory P. Duff received payments from drug or device companies?
CMS Open Payments shows $1,244 in general payments to Dr. Duff from 3 companies from 2016 to 2021. The largest total came from Summit Surgical Corp.
How long has Dr. Gregory P. Duff been practicing?
Dr. Duff graduated from medical school in 1992, 34 years ago.
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