Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Karley K Mathieu, MED

Counselor in Mansfield, MA · enumerated 2017.

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

National Provider Identifier

1386168060

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Registry record

Entity type Individual (Type 1)

Name Ms. Karley K Mathieu

Credential MED

Sex Female

Practice address 792 S Main St, Mansfield, MA, 02048

Phone (617) 461-7706

Enumeration date Aug 3, 2017

Last updated in NPPES Aug 3, 2017

Taxonomy & licenses

101Y00000X Counselor Behavioral Health & Social Service Providers 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

What is the NPI number for Karley Mathieu?

The National Provider Identifier (NPI) for Karley Mathieu is 1386168060, a Type 1 (individual) record in the CMS NPPES registry.

Where does Karley Mathieu practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-08-03.