Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Littlehorn, FNP

Family Nurse Practitioner in Tucson, AZ · enumerated 2012 · practices at Specialists in Dermatology, Pllc.

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

National Provider Identifier

1952645558

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Mary Littlehorn

Credential FNP

Sex Female

Practice address 2732 N Alvernon Way, Tucson, AZ, 85712

Phone (520) 382-3330

Enumeration date Nov 20, 2012

Last updated in NPPES Jul 6, 2021

Taxonomy & licenses

163WE0003X Emergency Registered Nurse Nursing Service Providers · License RN133474 (AZ) Secondary

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License F0113199 (AZ) Primary

FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan. About the FNP credential

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 Mary Littlehorn?

The National Provider Identifier (NPI) for Mary Littlehorn is 1952645558, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mary Littlehorn practice?

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

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-06.