Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Carolyn Arndt, LCMHC

Mental Health Counselor in Londonderry, NH · enumerated 2008.

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

National Provider Identifier

1821253204

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Registry record

Entity type Individual (Type 1)

Name Mrs. Carolyn Arndt

Credential LCMHC

Sex Female

Practice address 226 Rockingham Rd, Londonderry, NH, 03053

Phone (603) 425-2989

Fax (603) 425-2978

Enumeration date Jul 24, 2008

Last updated in NPPES Apr 5, 2012

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 497 (NH) 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 Carolyn Arndt?

The National Provider Identifier (NPI) for Carolyn Arndt is 1821253204, a Type 1 (individual) record in the CMS NPPES registry.

Where does Carolyn Arndt practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-04-05.