Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum Organization subpart

Castlewood Treatment Center LLC

Clinic/Center in Fenton, MO · enumerated 2008 · authorized official Heather Wilhelm, Director of Client Accounts.

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

National Provider Identifier

1790954410

Verified

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Registry record

Entity type Organization (Type 2)

Legal business name Castlewood Treatment Center LLC

Other name <Unavail>

Parent organization Castlewood Treatment Center

Practice address 1855 Bowles Ave, Suite 210, Fenton, MO, 63026

Phone (636) 779-1430

Fax (314) 686-4920

Enumeration date Feb 27, 2008

Last updated in NPPES Oct 10, 2023

Taxonomy & classification

261Q00000X Clinic/Center Ambulatory Health Care Facilities Primary

Authorized official

Name Heather Wilhelm

Title Director of Client Accounts

Phone (314) 222-7441

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 is Castlewood Treatment Center LLC located?

The practice location on file with NPPES is in Fenton, MO.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2023-10-10. Verify at npiregistry.cms.hhs.gov.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-10.