CATHERINE A HAJEK MD
NPI 1528219664
Internal Medicine in Sioux Falls, SD
About Catherine A Hajek Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CATHERINE A HAJEK MD (NPI 1528219664) is an individual internal medicine provider in Sioux Falls, South Dakota, licensed in South Dakota (8557) and active in the NPI registry since October 2008. She is enrolled in Medicare PECOS and is a graduate of Sanford School Of Medicine Of University Of South Dakota (2008).
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Catherine A Hajek Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Catherine Hajek reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Sioux Falls, SD 57105
- Reassigned Medicare billing, South Dakota enrollment
- 1,097 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 57104 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 5
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Catherine Hajek's NPI number?
The NPI number for Catherine Hajek is 1528219664. It was assigned to this individual provider in the NPPES registry on October 7, 2008.
Where is Catherine Hajek located?
Catherine Hajek practices at 1309 W 17th St Ste G01, Sioux Falls, SD 57104. The listed phone number is (605) 312-3400.
What is Catherine Hajek's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Catherine Hajek enrolled in Medicare?
Yes. Catherine Hajek is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Catherine Hajek's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Catherine Hajek reassigns Medicare benefits to Sanford Medical Center (Sioux Falls, SD). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Catherine Hajek's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Catherine Hajek accept?
Health plans from Medica, Sanford Health Plan, Wellmark Health Plan of Iowa, Inc. and Wellmark of South Dakota, Inc. list Catherine Hajek as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Catherine Hajek was last updated on December 9, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Catherine A Hajek, MD · NPI 1528219664
Internal Medicine physician in Sioux Falls, South Dakota. Individual provider, active in the CMS NPPES registry since October 7, 2008.
## Identity
- **NPI:** 1528219664 (Entity type: Individual)
- **Enumerated:** October 7, 2008
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 8557 (South Dakota)
- **Sole proprietor:** No
## Practice location
- **Address:** 1309 W 17TH ST STE G01, Sioux Falls, SD 57104-4664
- **Phone:** (605) 312-3400
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Sanford Medical Center (NPI 1093090342, Sioux Falls, SD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Sanford School Of Medicine Of University Of South Dakota, class of 2008
## Record status
- **NPPES last updated:** December 9, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1528219664) · Data from the CMS NPPES public registry.