NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Willem Jensen

Behavior Analyst in San Francisco, CA · enumerated 2017.

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

National Provider Identifier

1831621523

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Willem Jensen
Sex Male
Practice address 795 Folsom St, San Francisco, CA, 94107
Phone (855) 832-6727
Enumeration date Mar 31, 2017
Last updated in NPPES Mar 30, 2022

Taxonomy & licenses

172V00000X Community Health Worker Other Service Providers Secondary
106S00000X Behavior Technician Behavioral Health & Social Service Providers Secondary
103K00000X Behavior Analyst Behavioral Health & Social Service Providers · License 12375668-2506 (UT) 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 1831621523 active?
Yes, as of the latest NPPES snapshot, NPI 1831621523 is active (record last updated 2022-03-30).
How do I verify Willem Jensen's NPI record?
Cross-check NPI 1831621523 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-03-30.