Quick answers
- Where does Catherine B. Holznecht see patients?
- Medicare's clinician data lists 1 practice location in Dubuque, IA. Call before your visit to confirm the address.
- What is Catherine B. Holznecht's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Catherine B. Holznecht accept Medicare assignment?
- Yes. Medicare's clinician data says Catherine B. Holznecht accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Catherine B. Holznecht?
- (319) 589-8000, as listed in official Medicare / NPI Registry data.
- What is Catherine B. Holznecht's NPI number?
- 1689960023. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Catherine B. Holznecht is enrolled with Medicare (CMS data updated 2026-10-02).
- 250 Mercy DrDubuque, IA 52001 (319) 589‑8000
Group practices
Medicare enrollment lists Catherine B. Holznecht as a member of this group (CMS data updated 2026-10-02).
- Mercy Radiologists of Dubuque PC8 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Dubuque
Clinicians with the same Medicare primary specialty in Dubuque, IA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2011 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1689960023 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians