NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mrs. Linda Castor, R.N., L.C.P.C.

Professional Counselor in Springfield, IL · enumerated 2006 · practices at L. Williams Therapy, LLC.

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

National Provider Identifier

1518073691

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Registry record

Entity type Individual (Type 1)
Name Mrs. Linda Castor
Credential R.N., L.C.P.C.
Sex Female
Practice address Springfield, IL, 62704
Phone (217) 793-0680
Fax (217) 793-0684
Enumeration date Aug 22, 2006
Last updated in NPPES Jan 4, 2009

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 180004929 (IL) Primary
RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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.

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Frequently asked questions

Is NPI 1518073691 active?
Yes, as of the latest NPPES snapshot, NPI 1518073691 is active (record last updated 2009-01-04).
How do I verify Linda Castor's NPI record?
Cross-check NPI 1518073691 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-01-04.