Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

William T Mason, MD

Individual provider Internal Medicine Physician · NPI 1679579338

William T Mason, MD is an Internal Medicine Physician in Providence, Rhode Island. Licensed in Rhode Island. Registered with an NPI since 2005.

Licensed in
RI
In the registry since
2005
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1 Hoppin St 3rd Fl
Providence, RI 02903-4141
Phone: (401) 793-8400
Fax: (401) 793-8402
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence MD05520 (RI)
Rheumatology Physician Taxonomy 207RR0500X · Licence MD05520 (RI)

Record details

NPI number1679579338
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 27, 2005
Last updated in NPPESSeptember 7, 2007

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