William Duncan, MD, PHD
NPI 1396897302 · Endocrinology, Diabetes & Metabolism Physician · Washington, DC
William Duncan, MD, PHD is a Endocrinology, Diabetes & Metabolism Physician provider in Washington, DC (NPI 1396897302).
Provider details
- NPI number
- 1396897302
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- No
- License
- MD-021716-E (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-18
- Last updated
- 2007-07-08
Frequently asked questions
- What is William Duncan's NPI number?
- William Duncan's National Provider Identifier (NPI) is 1396897302, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Duncan's specialty?
- William Duncan is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is William Duncan located?
- William Duncan's practice location on file with NPPES is 6900 Georgia Ave Nw, Washington, DC 20307-0003.
- What is William Duncan's phone number?
- The practice phone number listed in the NPPES registry for William Duncan is (202) 278-6770.
- Is William Duncan's NPI active?
- Yes — William Duncan's NPI (1396897302) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.