Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Grant William Demuth

Behavior Analyst in Longmont, CO · enumerated 2025.

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

National Provider Identifier

1619838919

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Registry record

Entity type Individual (Type 1)

Name Grant William Demuth

Sex Male

Practice address 1823 Sunset Pl Ste C, Longmont, CO, 80501

Phone (720) 449-6676

Enumeration date Nov 18, 2025

Last updated in NPPES Nov 18, 2025

Taxonomy & licenses

103K00000X Behavior Analyst Behavioral Health & Social Service Providers 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1619838919 active?

Yes, as of the latest NPPES snapshot, NPI 1619838919 is active (record last updated 2025-11-18).

How do I verify Grant Demuth's NPI record?

Cross-check NPI 1619838919 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 2025-11-18.