Quick answers
- Does Catherine A. Hajek accept Medicare assignment?
- Yes. Medicare's clinician data says Catherine A. Hajek accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Catherine A. Hajek's NPI number?
- 1528219664. 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 A. Hajek is enrolled with Medicare (CMS data updated October 2, 2026).
- 1309 W 17th St, Suite G01Sioux Falls, SD 57104 (605) 312‑3400
- 4405 E 26th StSioux Falls, SD 57103
Group practices
Medicare enrollment lists Catherine A. Hajek as a member of this group (CMS data updated October 2, 2026).
- Sanford Medical Center857 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Sioux Falls
Clinicians with the same Medicare primary specialty in Sioux Falls, SD — not a recommendation.
Other clinicians in Sanford Medical Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Sanford School Of Medicine Of University Of South Dakota |
| Graduation year | 2008 (18 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1528219664 |
| 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 October 2, 2026, retrieved October 29, 2026
- 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