NPI Portal NPI Lookup & Verification

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

Mr. Christian David Muller I, CADTP CPR

Addiction (Substance Use Disorder) Counselor in Downey, CA · enumerated 2025 · practices at Southern California Alcohol and Drug Programs, Inc..

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

National Provider Identifier

1821970708

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Mr. Christian David Muller I
Credential CADTP CPR
Sex Male
Practice address Downey, CA, 90241
Phone (562) 923-7894
Enumeration date Jul 22, 2025
Last updated in NPPES Jul 22, 2025

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 22000 (CA) 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

What is the NPI number for Christian Muller?
The National Provider Identifier (NPI) for Christian Muller is 1821970708, a Type 1 (individual) record in the CMS NPPES registry.
Where does Christian Muller practice?
The practice location on file with NPPES is in Downey, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-07-22.