Gregory Duff, M.D.
NPI 1952374290 · Orthopaedic Surgery Physician · Silverdale, WA
Enrolled with Medicare as Practitioner - Orthopedic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Duff, M.D. is a Orthopaedic Surgery Physician provider in Silverdale, WA (NPI 1952374290).
Provider details
- NPI number
- 1952374290
- Entity type
- Individual
- Primary specialty
- Orthopaedic Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD00034439 (WA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
720 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 213 | $128 |
| X-Ray of Shoulder, Minimum of 2 Views73030 | 144 | $35 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 76 | $89 |
| Aspiration And/Or Injection of Fluid Large Joint Using Ultrasound Guidance20611 | 71 | $99 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 67 | $180 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 4 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Oxycodone Hcl/Acetaminophenbrand: Oxycodone-Acetaminophen | 73 | 51 |
| Cephalexin | 57 | 53 |
| Ondansetronbrand: Ondansetron Odt | 49 | 44 |
| Ibuprofen | 35 | 28 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-08
- Last updated
- 2020-12-02
- Certified
- 2020-12-02
Frequently asked questions
- What is Gregory Duff's NPI number?
- Gregory Duff's National Provider Identifier (NPI) is 1952374290, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Duff's specialty?
- Gregory Duff is listed in the NPPES registry with a primary specialty of Orthopaedic Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Duff located?
- Gregory Duff's practice location on file with NPPES is 4409 Nw Anderson Hill Rd, Silverdale, WA 98383-6807.
- What is Gregory Duff's phone number?
- The practice phone number listed in the NPPES registry for Gregory Duff is (360) 698-6630.
- Does Gregory Duff accept Medicare?
- Gregory Duff is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Duff's NPI active?
- Yes — Gregory Duff's NPI (1952374290) is active in the NPPES registry as of the last update on 2020-12-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.