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

Stephen Jack Altbaum, M.F.T.

Marriage & Family Therapist in Union City, CA · enumerated 2006.

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

National Provider Identifier

1851469894

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Registry record

Entity type Individual (Type 1)

Name Stephen Jack Altbaum

Credential M.F.T.

Sex Male

Practice address Union City, CA, 94587

Phone (510) 454-1000

Enumeration date Nov 30, 2006

Last updated in NPPES May 22, 2015

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

Taxonomy & licenses

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License 33756 (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 Stephen Altbaum?

The National Provider Identifier (NPI) for Stephen Altbaum is 1851469894, a Type 1 (individual) record in the CMS NPPES registry.

Where does Stephen Altbaum practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-05-22.