NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Charmaine Diaz, MSN APRN FNP-BC

Family Nurse Practitioner in Fairfield, CT · enumerated 2026.

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

National Provider Identifier

1306774021

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Charmaine Diaz
Credential MSN APRN FNP-BC
Sex Female
Practice address 425 Post Rd, Fairfield, CT, 06824
Phone (203) 254-2021
Fax (302) 254-2022
Enumeration date May 12, 2026
Last updated in NPPES Jun 4, 2026

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 16726 (CT) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Charmaine Diaz practice?
The practice location on file with NPPES is in Fairfield, CT. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Charmaine Diaz?
The National Provider Identifier (NPI) for Charmaine Diaz is 1306774021, 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 2026-06-04.