Karl Fenzl, MD
NPI 1427799378 · Diagnostic Radiology Physician · Madison, WI
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karl Fenzl, MD is a Diagnostic Radiology Physician provider in Madison, WI (NPI 1427799378).
Provider details
- NPI number
- 1427799378
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 84311 (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
4 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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
Registry dates
- Enumerated
- 2022-04-05
- Last updated
- 2024-08-15
- Certified
- 2024-08-15
Frequently asked questions
- What is Karl Fenzl's NPI number?
- Karl Fenzl's National Provider Identifier (NPI) is 1427799378, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karl Fenzl's specialty?
- Karl Fenzl is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Karl Fenzl located?
- Karl Fenzl's practice location on file with NPPES is Uw Hospitals & Clinics 600 Highland Ave, Madison, WI 53792-1465.
- What is Karl Fenzl's phone number?
- The practice phone number listed in the NPPES registry for Karl Fenzl is (608) 263-6400.
- Does Karl Fenzl accept Medicare?
- Karl Fenzl is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karl Fenzl's NPI active?
- Yes — Karl Fenzl's NPI (1427799378) is active in the NPPES registry as of the last update on 2024-08-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.