Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Willow Aba Services LLC

Q: What is the NPI number for Willow Aba Services LLC?

The NPI for Willow Aba Services LLC is 1639704372, a Type 2 (organization) record in the CMS NPPES registry.

Behavior Analyst in Southlake, TX · enumerated 2020 · authorized official Tanner Sierks, Owner.

Data current as of Jul 11, 2026 · sourced from CMS NPPES

National Provider Identifier

1639704372

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Registry record

Entity type Organization (Type 2)

Legal business name Willow Aba Services LLC

Practice address 2815 Exchange Blvd Ste 100, Southlake, TX, 76092

Phone (913) 375-3626

Enumeration date Mar 3, 2020

Last updated in NPPES Mar 3, 2020

Taxonomy & classification

103K00000X Behavior Analyst Behavioral Health & Social Service Providers Primary

Authorized official

Name Tanner Sierks

Title Owner

Phone (913) 375-3626

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 Willow Aba Services LLC?

The NPI for Willow Aba Services LLC is 1639704372, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Willow Aba Services LLC?

NPPES lists Tanner Sierks (Owner) as the authorized official for this organization.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2020-03-03.