Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Mary Elizabeth Thornton, LCSW

Clinical Social Worker in Lakewood, CO · enumerated 2007.

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

National Provider Identifier

1689724148

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Registry record

Entity type Individual (Type 1)

Name Mrs. Mary Elizabeth Thornton

Credential LCSW

Sex Female

Practice address 9485 W Colfax Ave, Lakewood, CO, 80215

Phone (303) 425-0300

Fax (303) 432-5260

Enumeration date Jan 10, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 991971 (CO) 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

How do I verify Mary Thornton's NPI record?

Cross-check NPI 1689724148 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1689724148 active?

Yes, as of the latest NPPES snapshot, NPI 1689724148 is active (record last updated 2007-07-08).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.