Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Catherine Marie Martin Frederick, CNP

Nurse Practitioner in Sioux Falls, SD · enumerated 2009.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1669608600

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Registry record

Entity type Individual (Type 1)

Name Mrs. Catherine Marie Martin Frederick

Credential CNP

Sex Female

Practice address 1508 W 22nd St Ste 101, Sioux Falls, SD, 57105

Phone (605) 328-3840

Enumeration date Jun 4, 2009

Last updated in NPPES May 14, 2024

Taxonomy & licenses

363LA2100X Acute Care Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License CP000522 (SD) Secondary

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License CP000522 (SD) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Catherine Martin Frederick?

The National Provider Identifier (NPI) for Catherine Martin Frederick is 1669608600, a Type 1 (individual) record in the CMS NPPES registry.

Where does Catherine Martin Frederick practice?

The practice location on file with NPPES is in Sioux Falls, SD. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-14.