NPPES file of Aug 9, 2026

William T. Mason, M.D.

Internal Medicine Physician · Providence, RI

William T. Mason, M.D. is an internal medicine physician with a practice address in Providence, Rhode Island, and NPI 1679579338, issued on Jun 27, 2005. Check the license (Rhode Island MD05520, as entered in NPPES) on the Rhode Island Board of Medical Licensure and Discipline; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1679579338
Name
William T. Mason
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
MD05520 RI
Self-reported in NPPES; status is on the state search
Practice location
1 Hoppin St, Providence, RI 02903
Phone
(401) 793-8400
Enumerated
Jun 27, 2005
Record last updated
Sep 7, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(401) 793-8402
Medicaid ID
7001782 RI
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 1,033 in Rhode Island → Look up another NPI →

Also registered at 1 Hoppin St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Caroline Alday, PHDClinical Psychologist1174570345
  2. David Barker, PH.D.Clinical Child & Adolescent Psychologist1194081083
  3. Sara Becker, PH.D.Clinical Child & Adolescent Psychologist1811275043
  4. Kristen Benito, PH.D.Clinical Child & Adolescent Psychologist1770849242
  5. L. Bidwell, PH.D.Clinical Child & Adolescent Psychologist1689935447
  6. Bradley Bloom, MDPediatric Rheumatology Physician1568643096

Verify William T. Mason in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersRhode Island Board of Medical Licensure and Discipline
    Search for license MD05520    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Rhode Island license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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William T. Mason among 1,033 internal medicine physician records in Rhode Island

William T. Mason, M.D. is one of 1,033 internal medicine physician records with a practice address in Rhode Island. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 90% newer
  • In a Medicare fileNo · 80% of these records are
  • In the CMS Doctors and Clinicians fileNo · 57% of these records are
  • Record last updated2007 · 48% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Rhode Island practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

511 internal medicine physician records list a practice address in Providence

They are 511 of the 9,647 NPPES records with a practice address in Providence, and 1,033 internal medicine physician records in Rhode Island. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 1,033 in Rhode Island → Every provider in Providence → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Kristin Anderson, MDProvidence, RI 029031740236173
  2. Andrew Bostom, MDProvidence, RI 029031902850274
  3. Sybil Cineas, MDProvidence, RI 029031053364984
  4. Heinrich Elinzano, M.D.Providence, RI 029031063477032
  5. Rebekah Gardner, MDProvidence, RI 029031275597536
  6. Sajeev Handa, MDProvidence, RI 029031528012747
  7. Donnah Mathews, MDProvidence, RI 029031942288097
  8. Mark Mattingly, M.D.Providence, RI 029031073500757

Common questions

What is William T. Mason, M.D.'s NPI number?

William T. Mason, M.D.'s National Provider Identifier (NPI) is 1679579338, issued on Jun 27, 2005. An NPI identifies a provider in billing; it is not a license.

Where is William T. Mason, M.D. located?

The NPPES record lists a practice address at 1 Hoppin St, Providence, RI, 02903. Phone: (401) 793-8400. Providers update this record themselves, so call before visiting.

How can I verify William T. Mason, M.D.'s license?

NPPES lists Rhode Island license number MD05520, as entered by the provider. Search the Rhode Island Board of Medical Licensure and Discipline at https://healthri.mylicense.com/Verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.