Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Harley Annabelle Mason, MSW,LSW
Social Worker in Alton, IL · enumerated 2025.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1952285694
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Registry record
Entity type Individual (Type 1)
Name Harley Annabelle Mason
Credential MSW,LSW
Sex Female
Practice address 2615 Edwards St, Alton, IL, 62002
Phone (618) 462-2331
Fax (618) 462-2504
Enumeration date Aug 5, 2025
Last updated in NPPES Oct 29, 2025
Taxonomy & licenses
104100000X Social Worker Behavioral Health & Social Service Providers · License 150.118155 (IL) 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.
Frequently asked questions
How do I verify Harley Mason's NPI record?
Cross-check NPI 1952285694 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1952285694 active?
Yes, as of the latest NPPES snapshot, NPI 1952285694 is active (record last updated 2025-10-29).
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-10-29.