Catherine A Hajek, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

8557 Issued in SD

Practice address

1309 W 17TH St Ste G01
Sioux Falls, SD 57104-4664

Phone

(605) 312-3400

NPI assigned

Oct 7, 2008

Sex

Female

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in SD

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Medicare enrollment (NPD)

Not enrolled

HHS exclusion list flag

Flagged The directory lists this NPI on an HHS exclusion list. The OIG exclusions file (LEIE) holds no record for this NPI, and the directory does not say which list the flag comes from. How exclusions are shown Confirm with the OIG exclusions search.

Credentials

Doctor of Medicine

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Sanford Medical Center

  • Family Medicine Physician
  • Sioux Falls, SD
  • NPI 1093090342
  Medicare reassignment
• Sanford Medical Center

  • Rural Health Clinic/Center
  • Lake Norden, SD
  • NPI 1417927559
  NPD
• One Medical of Ny, P.C.

  • Family Medicine Physician
  • New York, NY
  • NPI 1861709487

  Internal Medicine

  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1223337600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765238400000",
    "number": "1528219664",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 5074",
            "city": "SIOUX FALLS",
            "state": "SD",
            "postal_code": "571175074"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1309 W 17TH ST STE G01",
            "city": "SIOUX FALLS",
            "state": "SD",
            "postal_code": "571044664",
            "telephone_number": "605-312-3400"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HAJEK",
        "first_name": "CATHERINE",
        "middle_name": "A",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2008-10-07",
        "last_updated": "2025-12-09",
        "certification_date": "2025-12-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "SD",
            "license": "8557",
            "primary": true
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "NY",
            "license": "261236",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Lincoln Haiby, PHARMD
• Jena Rae Haigh, DPT
• Kelly M Haines, CRNA
• Hair Happens LLC
• Rizan A Hajal, MD
• Natalie Ruth Haken, DC
• Susan J Halbritter, CNP
• Sierra Rein Halbur
• Jenna Hale, CRNA
• Kareem Halim, MD

• Internal Medicine Physician in Sioux Falls, SD
• Providers in Sioux Falls, SD by specialty
• Internal Medicine Physician in South Dakota

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 9, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.