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

William Michael Brennan Sr., DDS

Individual provider Dentist · NPI 1235142746

William Michael Brennan Sr., DDS is a Dentist in Downers Grove, Illinois. Practices as a sole proprietor. Licensed in Illinois.

Licensed in
IL
In the registry since
2006
What do these letters mean?
DDS — Doctor of Dental Surgery
A dentist. DDS and DMD are the same qualification — universities choose which title to award.

See every abbreviation used in this directory →

Practice location Address checks out

5133 Washington St
Downers Grove, IL 60515
Phone: (630) 969-4645
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Dentist (primary) Taxonomy 122300000X · Licence 19A15602 (IL)

Record details

NPI number1235142746
Entity typeIndividual (Type 1)
GenderMale
Credentials DDS
Sole proprietorYes
NPI enumeratedAugust 14, 2006
Last updated in NPPESJuly 8, 2007
Mailing address5133 Washington St, Downers Grove, IL 60515

Other providers in Downers Grove