Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Caryn Dunster Mastalli, FNP

Anesthesiology Physician in Durham, NC · enumerated 2006 · practices at Duke University Medical Center.

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

National Provider Identifier

1538242789

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Registry record

Entity type Individual (Type 1)

Name Caryn Dunster Mastalli

Credential FNP

Sex Female

Practice address Duke University Medical Ctr, Durham, NC, 27710

Phone (919) 681-7030

Enumeration date Oct 23, 2006

Last updated in NPPES Jan 5, 2015

Taxonomy & licenses

207L00000X Anesthesiology Physician Allopathic & Osteopathic Physicians · License 201399 (NC) 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

Where does Caryn Mastalli practice?

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

What is the NPI number for Caryn Mastalli?

The National Provider Identifier (NPI) for Caryn Mastalli is 1538242789, 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 2015-01-05.