Katherine Flynn-O'Brien, M.D.
NPI 1225327398 · Pediatric Surgery Physician · Milwaukee, WI
Enrolled with Medicare as Practitioner - General Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katherine Flynn-O'Brien, M.D. is a Pediatric Surgery Physician provider in Milwaukee, WI (NPI 1225327398).
Provider details
- NPI number
- 1225327398
- Entity type
- Individual
- Primary specialty
- Pediatric Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 69080-20 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
5 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Additional practice locations (4)
- 3195 Hillside DrDelafield, WI 53018-2189Phone: (414) 266-6550Fax: (414) 266-6579
- 1655 W Mequon RdMequon, WI 53092-3254Phone: (414) 266-6550Fax: (414) 266-6579
- 9200 W Wisconsin AveMilwaukee, WI 53226-3522Phone: (414) 805-5800Fax: (414) 805-8097
- 4855 S Moorland RdNew Berlin, WI 53151-7494Phone: (414) 266-6550Fax: (414) 266-6579
Registry dates
- Enumerated
- 2011-03-29
- Last updated
- 2024-03-11
- Certified
- 2024-03-11
Frequently asked questions
- What is Katherine Flynn-O'Brien's NPI number?
- Katherine Flynn-O'Brien's National Provider Identifier (NPI) is 1225327398, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katherine Flynn-O'Brien's specialty?
- Katherine Flynn-O'Brien is listed in the NPPES registry with a primary specialty of Pediatric Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Katherine Flynn-O'Brien located?
- Katherine Flynn-O'Brien's practice location on file with NPPES is 9000 W Wisconsin Ave, Milwaukee, WI 53226-4874.
- What is Katherine Flynn-O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Katherine Flynn-O'Brien is (414) 266-6550.
- Does Katherine Flynn-O'Brien accept Medicare?
- Katherine Flynn-O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katherine Flynn-O'Brien's NPI active?
- Yes — Katherine Flynn-O'Brien's NPI (1225327398) is active in the NPPES registry as of the last update on 2024-03-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.