Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Stefan Jude Keyser

Marriage & Family Therapist in Grass Valley, CA · enumerated 2013.

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

National Provider Identifier

1235477423

Verified

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Registry record

Entity type Individual (Type 1)

Name Mr. Stefan Jude Keyser

Sex Male

Practice address 500 Crown Point Cir Ste 100, Grass Valley, CA, 95945

Phone (530) 273-5440

Enumeration date Jan 22, 2013

Last updated in NPPES Feb 1, 2021

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers Secondary

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License 93671 (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

Where does Stefan Keyser practice?

The practice location on file with NPPES is in Grass Valley, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Stefan Keyser?

The National Provider Identifier (NPI) for Stefan Keyser is 1235477423, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-01.