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

John T Brennan, MD

Individual provider Emergency Medicine Physician · NPI 1891776977

John T Brennan, MD is an Emergency Medicine Physician in Onalaska, Wisconsin. Works from 4 locations. Licensed in Minnesota and Wisconsin.

Licensed in
MN, WI
In the registry since
2005
Specialties on file
4
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

191 Theater Rd
Onalaska, WI 54650
Phone: (608) 785-0940
Show map & directions

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

Additional practice locations (3)

  • 800 West Ave S, La Crosse, WI 54601-8806 — (608) 785-0940
  • 325 Butts Ave, Tomah, WI 54660-1412 — (608) 785-0940
  • 325 Butts Ave, Tomah, WI 54660-1412 — (608) 785-0940

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 16368 (WI)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 16368 (WI)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 21682 (MN)
Internal Medicine Physician Taxonomy 207R00000X · Licence 16368 (WI)

Record details

NPI number1891776977
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 7, 2005
Last updated in NPPESJune 13, 2019
Mailing addressPo Box 1510, Eau Claire, WI 54702-1510

Other providers in Onalaska