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

Dr. William Stassen, MD

Individual provider Gastroenterology Physician · NPI 1548245079

Dr. William Stassen, MD is a Gastroenterology Physician in Austin, Texas. Licensed in Texas. Registered with an NPI since 2005.

Licensed in
TX
In the registry since
2005
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

8015 Shoal Creek Blvd Ste 118
Austin, TX 78757-8052
Phone: (512) 244-2273
Fax: (512) 671-7883
Show map & directions

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

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence G7893 (TX)

Record details

NPI number1548245079
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 7, 2005
Last updated in NPPESJanuary 8, 2013

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