William Mason, M.D.
NPI 1679579338 · Internal Medicine Physician · Providence, RI
William Mason, M.D. is a Internal Medicine Physician provider in Providence, RI (NPI 1679579338).
Provider details
- NPI number
- 1679579338
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD05520 (RI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
- 2005-06-27
- Last updated
- 2007-09-07
Frequently asked questions
- What is William Mason's NPI number?
- William Mason's National Provider Identifier (NPI) is 1679579338, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mason's specialty?
- William Mason is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Mason located?
- William Mason's practice location on file with NPPES is 1 Hoppin St, Providence, RI 02903-4141.
- What is William Mason's phone number?
- The practice phone number listed in the NPPES registry for William Mason is (401) 793-8400.
- Is William Mason's NPI active?
- Yes — William Mason's NPI (1679579338) is active in the NPPES registry as of the last update on 2007-09-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.