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

Dr. William Steven Mark, MD

Individual provider Internal Medicine Physician · NPI 1396955522

Dr. William Steven Mark, MD is an Internal Medicine Physician in Phoenixville, Pennsylvania. Practices as a sole proprietor. Licensed in Pennsylvania.

Licensed in
PA
In the registry since
2007
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

143 Church St
Phoenixville, PA 19460-3438
Phone: (610) 935-1134
Fax: (610) 935-8191
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 012108E (PA)

Record details

NPI number1396955522
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMay 23, 2007
Last updated in NPPESJuly 8, 2007
Mailing address26 Salem Way, Malvern, PA 19355-9705

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