Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Catherine E Grimsley, MSN PMHNP-BC

Psychiatric/Mental Health Nurse Practitioner in Sioux City, IA · enumerated 2021.

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

National Provider Identifier

1609543933

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Registry record

Entity type Individual (Type 1)

Name Catherine E Grimsley

Credential MSN PMHNP-BC

Sex Female

Practice address 4230 Hamilton Blvd, Sioux City, IA, 51104

Phone (712) 239-4300

Fax (712) 239-2866

Enumeration date Aug 25, 2021

Last updated in NPPES Feb 27, 2026

Taxonomy & licenses

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License G164736 (IA) 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

Where does Catherine Grimsley practice?

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

What is the NPI number for Catherine Grimsley?

The National Provider Identifier (NPI) for Catherine Grimsley is 1609543933, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-02-27.