Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Diane Lee Sisson, LCSW

Q: What is the NPI number for Diane Sisson?

The National Provider Identifier (NPI) for Diane Sisson is 1104546456, a Type 1 (individual) record in the CMS NPPES registry.

Professional Counselor in Litchfield, CT · enumerated 2022.

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

National Provider Identifier

1104546456

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Ms. Diane Lee Sisson

Credential LCSW

Sex Female

Practice address 550 Goshen Rd, Litchfield, CT, 06759

Phone (860) 567-9423

Enumeration date Aug 29, 2022

Last updated in NPPES Aug 29, 2022

Taxonomy & licenses

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 03-729157 (CT) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

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 Diane Sisson?

The National Provider Identifier (NPI) for Diane Sisson is 1104546456, a Type 1 (individual) record in the CMS NPPES registry.

Where does Diane Sisson practice?

The practice location on file with NPPES is in Litchfield, CT. 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 2022-08-29.