Physician Profile
Unclaimed ProfileAbout DUFF
Gregory P Duff, M.D. is a healthcare provider in Silverdale, WA specialising in orthopedic surgery. Gregory trained at Harvard Medical School, graduating in 1992. Gregory is also listed as specialising in orthopaedic surgery.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What is Dr. Duff's specialty?
Dr. Duff is an orthopedic surgeon in Silverdale, WA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “ORTHOPEDIC SURGERY”.
NPI registry
Where can I find Dr. Duff?
Dr. Duff is listed at 4409 NW ANDERSON HILL RD, Silverdale, WA 98383. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Duff?
The number on file is (360) 698-6630. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Duff's NPI number?
Dr. Duff's National Provider Identifier is 1952374290. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Dr. Duff's medical education?
Dr. Duff attended Harvard Medical School, graduating in 1992. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Duff been practising?
Dr. Duff has 34 years experience. Calculated from a graduation year of 1992, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Duff known for?
According to Medicare billing data, Dr. Duff performs procedures including aspiration and/or injection of fluid large joint using ultrasound guidance and prosthetic repair of shoulder joint, total shoulder; reads or performs imaging such as x-ray of shoulder, minimum of 2 views and x-ray of knee, 4 or more views, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Duff confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Duff. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (360) 698-6630
- Email not available
Practice Locations
4409 NW ANDERSON HILL RD
Silverdale, WA 98383
Procedures Most Often Billed to Medicare
1,068 services · 633 patients · 12 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Aspiration and/or injection of fluid large joint using ultrasound guidance | Procedure | 20611 |
71 |
| Prosthetic repair of shoulder joint, total shoulder | Procedure | 23472 |
25 |
| X-ray of shoulder, minimum of 2 views | Imaging | 73030 |
144 |
| X-ray of knee, 4 or more views | Imaging | 73564 |
25 |
| X-ray of elbow, minimum of 3 views | Imaging | 73080 |
13 |
| X-ray of hip, 2-3 views | Imaging | 73502 |
11 |
| Injection, triamcinolone acetonide, not otherwise specified, 10 mg | Drug given | J3301 |
348 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
213 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
76 |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
67 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other orthopedic surgeons at this location 5
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 27 related providers in 4 groups
Other orthopedic surgeons in Silverdale 3
Same specialty, same city.
Trained at Harvard Medical School 8
Other providers in the same specialty who trained at the same institution.
Class of 1992 at Harvard Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Aspiration and/or injection of fluid large joint using ultrasound guidance 8
Providers in WA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.