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CATHERINE A HAJEK MD
NPI 1528219664
Internal Medicine in Sioux Falls, SD

Active since October 07, 2008
1309 W 17TH ST STE G01, SIOUX FALLS, SD 57104(605) 312-3400 Get Directions Write a Review

NPPES record last updated: December 9, 2025. Verified against the NPPES registry weekly; last sync: July 26, 2026.

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.

NPPES Registry Identity

NPI1528219664
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameCATHERINE A HAJEKCredential: MD
Location Address1309 W 17TH ST STE G01Sioux Falls, SD 57104-4664
Mailing AddressPo Box 5074Sioux Falls, SD 57117-5074
Phone(605) 312-3400
Sole ProprietorNo
Enumeration DateOctober 7, 2008
Last NPPES UpdateDecember 9, 2025
NPPES CertifiedDecember 9, 2025
✔ NPI 1528219664 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in SD · 8557✔ Licensed in NY · 261236
Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

1309 W 17TH ST STE G01, Sioux Falls, SD 57104
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Medica, Sanford Health Plan.Insurance ›

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. SHIRLENE K SMOOK MD
Family Medicine
1309 W 17TH ST STE G01
SIOUX FALLS, SD 57104
Minnehaha County (605) 312-3400
COLLEEN SCHMIDT
Nurse Practitioner (Family)
1309 W 17TH ST STE G01
SIOUX FALLS, SD 57104
Minnehaha County (605) 314-3400
SANFORD CLINIC
Radiology (Radiation Oncology)
1309 W 17TH ST STE G01
SIOUX FALLS, SD 57104
Minnehaha County (605) 312-3400
RAYCHEL ROSE SCHURMAN PA-C
Physician Assistant
1309 W 17TH ST STE G01
SIOUX FALLS, SD 57104
Minnehaha County (605) 312-3400

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.

What insurance does Catherine Hajek accept?

Health plans from Medica and Sanford Health Plan 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 with the weekly NPPES data releases published by CMS.