NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

James Anthony Mastrostefano, APRN-CNP

Family Nurse Practitioner in Newport, RI · enumerated 2021.

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

National Provider Identifier

1083384036

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name James Anthony Mastrostefano
Credential APRN-CNP
Sex Male
Practice address 50 Memorial Blvd, Newport, RI, 02840
Phone (401) 606-4510
Fax (401) 619-4784
Enumeration date Sep 20, 2021
Last updated in NPPES Dec 15, 2021

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License APRN02825 (RI) Primary
163W00000X Registered Nurse Nursing Service Providers · License RN1047330 (RI) 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

What is the NPI number for James Mastrostefano?
The National Provider Identifier (NPI) for James Mastrostefano is 1083384036, a Type 1 (individual) record in the CMS NPPES registry.
Where does James Mastrostefano practice?
The practice location on file with NPPES is in Newport, RI. 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 2021-12-15.