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

John Chase Callon, ADT

Addiction (Substance Use Disorder) Counselor in Frederick, MD · enumerated 2021.

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

National Provider Identifier

1528639598

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Registry record

Entity type Individual (Type 1)

Name John Chase Callon

Credential ADT

Sex Male

Practice address Frederick, MD, 21701

Phone (240) 801-7799

Enumeration date Jul 9, 2021

Last updated in NPPES Jul 9, 2021

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 ADT2211 (MD) 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.

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Frequently asked questions

How do I verify John Callon's NPI record?

Cross-check NPI 1528639598 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1528639598 active?

Yes — as of the latest NPPES snapshot, NPI 1528639598 is active (record last updated 2021-07-09).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-09.