Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Colleen Castellani, CGC

Genetic Counselor (M.S.) in Lebanon, NH · enumerated 2024.

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

National Provider Identifier

1821825936

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Registry record

Entity type Individual (Type 1)

Name Colleen Castellani

Credential CGC

Sex Female

Practice address 1 Medical Dr, Lebanon, NH, 03756

Phone (603) 727-7814

Enumeration date Sep 14, 2024

Last updated in NPPES Sep 14, 2024

Taxonomy & licenses

170300000X Genetic Counselor (M.S.) Other Service Providers · License 0537 (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 Colleen Castellani?

The National Provider Identifier (NPI) for Colleen Castellani is 1821825936, a Type 1 (individual) record in the CMS NPPES registry.

Where does Colleen Castellani practice?

The practice location on file with NPPES is in Lebanon, NH. 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 2024-09-14.