Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Grace Willoughby
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 28, 2026
Taxonomy & licenses
103K00000X Behavior Analyst Behavioral Health & Social Service Providers · License 1-25-79610 (AZ) 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.
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.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-28.