Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Esther S Underdown, CADC

Clinical Social Worker in Rockland, ME · enumerated 2010.

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

National Provider Identifier

1073825618

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Registry record

Entity type Individual (Type 1)

Name Esther S Underdown

Credential CADC

Sex Female

Practice address 12 Union St, Rockland, ME, 04841

Phone (207) 701-4400

Enumeration date Jul 12, 2010

Last updated in NPPES Sep 23, 2025

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers Primary

Other identifiers

Identifier	Type	State	Issuer
435943199	Medicaid	ME	-

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.

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Frequently asked questions

What is the NPI number for Esther Underdown?

The National Provider Identifier (NPI) for Esther Underdown is 1073825618, a Type 1 (individual) record in the CMS NPPES registry.

Where does Esther Underdown practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-23.