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

William James Mugg, MD

Individual provider Internal Medicine Physician · NPI 1689761959

William James Mugg, MD is an Internal Medicine Physician in So Hadley, Massachusetts. Licensed in Massachusetts. Registered with an NPI since 2006.

Licensed in
MA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

96 Lyman St
So Hadley, MA 01075
Phone: (413) 533-7176
Fax: (413) 552-0181
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 38722 (MA)

Record details

NPI number1689761959
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 6, 2006
Last updated in NPPESFebruary 14, 2013