William Phelps, M.D.
NPI 1578515458 · Geriatric Medicine (Internal Medicine) Physician · Green Valley, AZ
William Phelps, M.D. is a Geriatric Medicine (Internal Medicine) Physician provider in Green Valley, AZ (NPI 1578515458).
Provider details
- NPI number
- 1578515458
- Entity type
- Individual
- Primary specialty
- Geriatric Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 24727 (AZ)
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
20 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
- 2006-05-17
- Last updated
- 2007-11-13
Frequently asked questions
- What is William Phelps's NPI number?
- William Phelps's National Provider Identifier (NPI) is 1578515458, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Phelps's specialty?
- William Phelps is listed in the NPPES registry with a primary specialty of Geriatric Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is William Phelps located?
- William Phelps's practice location on file with NPPES is 101 W. Duval Rd, Green Valley, AZ 85614-5280.
- What is William Phelps's phone number?
- The practice phone number listed in the NPPES registry for William Phelps is (520) 625-2950.
- Is William Phelps's NPI active?
- Yes — William Phelps's NPI (1578515458) is active in the NPPES registry as of the last update on 2007-11-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.