Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Katherine Theresa Flynn-O'Brien, MD

Individual provider Pediatric Surgery Physician · NPI 1225327398

Katherine Theresa Flynn-O'Brien, MD is a Pediatric Surgery Physician in Milwaukee, Wisconsin. Works from 5 locations. Licensed in Wisconsin.

Licensed in
WI
In the registry since
2011
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

9000 W Wisconsin Ave
Milwaukee, WI 53226-4874
Phone: (414) 266-6550
Fax: (414) 266-6579
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (4)

  • 3195 Hillside Dr, Delafield, WI 53018-2189 — (414) 266-6550
  • 1655 W Mequon Rd, Mequon, WI 53092-3254 — (414) 266-6550
  • 9200 W Wisconsin Ave, Milwaukee, WI 53226-3522 — (414) 805-5800
  • 4855 S Moorland Rd, New Berlin, WI 53151-7494 — (414) 266-6550

Specialties & licences

Pediatric Surgery Physician (primary) Taxonomy 2086S0120X · Licence 69080-20 (WI)

Record details

NPI number1225327398
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 29, 2011
Last updated in NPPESMarch 11, 2024
Certification dateMarch 11, 2024

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