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

Dr. William Neal Duffy, MD

Individual provider Internal Medicine Physician · NPI 1538108055

Dr. William Neal Duffy, MD is an Internal Medicine Physician in Conshohocken, Pennsylvania. Licensed in Pennsylvania. Registered with an NPI since 2006.

Licensed in
PA
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

161 Washington St Ste 1550
Conshohocken, PA 19428
Phone: (610) 200-0250
Fax: (610) 200-0253
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 MD060436L (PA)

Record details

NPI number1538108055
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 6, 2006
Last updated in NPPESMarch 18, 2026
Certification dateMarch 18, 2026

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