Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Grace Willoughby

Assistant Behavior Analyst in Tucson, AZ · enumerated 2023.

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

National Provider Identifier

1356045363

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Registry record

Entity type Individual (Type 1)

Name Grace Willoughby

Sex Female

Practice address 3710 W Overton Rd, Tucson, AZ, 85742

Phone (520) 485-8846

Enumeration date Mar 27, 2023

Last updated in NPPES Jul 10, 2026

Taxonomy & licenses

106E00000X Assistant Behavior Analyst Behavioral Health & Social Service Providers Primary

103K00000X Behavior Analyst Behavioral Health & Social Service Providers · License 1-25-79610 (AZ) Secondary

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 Grace Willoughby practice?

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

What is the NPI number for Grace Willoughby?

The National Provider Identifier (NPI) for Grace Willoughby is 1356045363, 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 2026-07-10.