Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Kathleen J.S. Mills, PHD, LICSW

Clinical Social Worker in Lancaster, MA · enumerated 2020.

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

National Provider Identifier

1285248849

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Registry record

Entity type Individual (Type 1)

Name Dr. Kathleen J.S. Mills

Credential PHD, LICSW

Sex Female

Practice address 971 Main St, Lancaster, MA, 01523

Phone (978) 368-4878

Enumeration date Sep 1, 2020

Last updated in NPPES Nov 27, 2023

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 1029307 (MA) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
1029307	Other	MA	BOARD OF SOCIAL WORKERS

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

Where does Kathleen Mills practice?

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

What is the NPI number for Kathleen Mills?

The National Provider Identifier (NPI) for Kathleen Mills is 1285248849, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-11-27.