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

John William Rex Sr., LAC

Addiction (Substance Use Disorder) Counselor in Miles City, MT · enumerated 2007.

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

National Provider Identifier

1366577934

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Registry record

Entity type Individual (Type 1)

Name John William Rex Sr.

Credential LAC

Sex Male

Practice address Miles City, MT, 59301

Phone (406) 853-3714

Enumeration date Feb 22, 2007

Last updated in NPPES May 14, 2022

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

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 1029 (MT) Primary

LAC · Licensed Acupuncturist: A practitioner licensed to perform acupuncture. About the LAC 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

How do I verify John Rex's NPI record?

Cross-check NPI 1366577934 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1366577934 active?

Yes, as of the latest NPPES snapshot, NPI 1366577934 is active (record last updated 2022-05-14).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-05-14.