William Duff, RPA-C
NPI 1780603456 · Medical Physician Assistant · Prescott, AZ
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Duff, RPA-C is a Medical Physician Assistant provider in Prescott, AZ (NPI 1780603456).
Provider details
- NPI number
- 1780603456
- Entity type
- Individual
- Primary specialty
- Medical Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- RPA-C
- Sex
- Male
- Sole proprietor
- No
- License
- 7868 (AZ)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 2 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Fluticasone Propionate | 11 |
| Atorvastatin Calcium | 11 |
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
- 2006-07-19
- Last updated
- 2026-02-26
- Certified
- 2026-02-26
Frequently asked questions
- What is William Duff's NPI number?
- William Duff's National Provider Identifier (NPI) is 1780603456, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Duff's specialty?
- William Duff is listed in the NPPES registry with a primary specialty of Medical Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is William Duff located?
- William Duff's practice location on file with NPPES is 2245 E State Route 69, Prescott, AZ 86301-5674.
- What is William Duff's phone number?
- The practice phone number listed in the NPPES registry for William Duff is (833) 688-6247.
- Does William Duff accept Medicare?
- William Duff is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Duff's NPI active?
- Yes — William Duff's NPI (1780603456) is active in the NPPES registry as of the last update on 2026-02-26.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.