Catherine Hajek, MD
NPI 1528219664 · Internal Medicine Physician · Sioux Falls, SD
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Catherine Hajek, MD is a Internal Medicine Physician provider in Sioux Falls, SD (NPI 1528219664).
Provider details
- NPI number
- 1528219664
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 8557 (SD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-10-07
- Last updated
- 2025-12-09
- Certified
- 2025-12-09
Frequently asked questions
- What is Catherine Hajek's NPI number?
- Catherine Hajek's National Provider Identifier (NPI) is 1528219664, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Catherine Hajek's specialty?
- Catherine Hajek is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Catherine Hajek located?
- Catherine Hajek's practice location on file with NPPES is 1309 W 17th St Ste G01, Sioux Falls, SD 57104-4664.
- What is Catherine Hajek's phone number?
- The practice phone number listed in the NPPES registry for Catherine Hajek is (605) 312-3400.
- Does Catherine Hajek accept Medicare?
- Catherine Hajek is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Catherine Hajek's NPI active?
- Yes — Catherine Hajek's NPI (1528219664) is active in the NPPES registry as of the last update on 2025-12-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.