Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Carol Ann Horwitt, ARNP

Obstetrics & Gynecology Nurse Practitioner in Seattle, WA · enumerated 2006.

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

National Provider Identifier

1588748297

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Registry record

Entity type Individual (Type 1)

Name Carol Ann Horwitt

Credential ARNP

Sex Female

Practice address 1229 Madison St Ste 1450, Seattle, WA, 98104

Phone (206) 215-6300

Fax (206) 215-6301

Enumeration date Oct 25, 2006

Last updated in NPPES Sep 19, 2008

Taxonomy & licenses

363LX0001X Obstetrics & Gynecology Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License RN00045364 (WA) 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 Carol Horwitt practice?

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

What is the NPI number for Carol Horwitt?

The National Provider Identifier (NPI) for Carol Horwitt is 1588748297, 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 2008-09-19.