Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Catherine A Hajek, MD

Individual provider Internal Medicine Physician · NPI 1528219664

Catherine A Hajek, MD is an Internal Medicine Physician in Sioux Falls, South Dakota. Licensed in New York and South Dakota. Registered with an NPI since 2008.

Licensed in
NY, SD
In the registry since
2008
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1309 W 17th St Ste G01
Sioux Falls, SD 57104-4664
Phone: (605) 312-3400
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 8557 (SD)
Internal Medicine Physician Taxonomy 207R00000X · Licence 261236 (NY)

Record details

NPI number1528219664
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 7, 2008
Last updated in NPPESDecember 9, 2025
Certification dateDecember 9, 2025

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