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WILLOW ABA SERVICES
NPI 1205466612
Behavior Analyst in Littleton, CO

Active since January 24, 2020
8000 S LINCOLN ST STE 10, LITTLETON, CO 80122(720) 316-7614(720) 316-7614 Get Directions Write a Review

NPPES record last updated: September 26, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Oct 27, 2020, Jul 3, 2020, Jan 24, 2020 (3 updates tracked since 2020).

About Willow Aba Services NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLOW ABA SERVICES (NPI 1205466612) is a healthcare organization registered as a behavior analyst in Littleton, Colorado and active in the NPI registry since January 2020. The organization lists Tanner Sierks Sierks, Owner, as its authorized official.

NPPES Registry Identity

NPI1205466612
Entity TypeOrganization
Primary Taxonomy103K00000X
Legal Business NameWILLOW ABA SERVICES
Location Address8000 S LINCOLN ST STE 10Littleton, CO 80122-2725
Mailing Address8000 S Lincoln St Ste 10Littleton, CO 80122-2725 · (720) 319-7614 · Fax (720) 319-7614
Phone(720) 316-7614
Fax(720) 316-7614
Organization SubpartNo
Authorized OfficialTanner Sierks SierksOwner · (720) 319-7614
Enumeration DateJanuary 24, 2020
Last NPPES UpdateSeptember 26, 20253 updates tracked since enumeration
NPPES CertifiedSeptember 26, 2025
✔ NPI 1205466612 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyBehavior AnalystBehavioral Health & Social Service Providers
Taxonomy Code103K00000X
Definition
A behavior analyst is qualified by at least a master's degree and Behavior Analyst Certification Board certification and/or a state-issued credential (such as a license) to practice behavior analysis independently. Behavior analysts provide the required supervision to assistant behavior analysts and behavior technicians. A behavior analyst delivers services consistent with the dimensions of applied behavior analysis. Common services may include, but are not limited to, conducting behavioral assessments, analyzing data, writing and revising behavior-analytic treatment plans, training others to implement components of treatment plans, and overseeing implementation of treatment plans.
8000 S LINCOLN ST STE 10, Littleton, CO 80122
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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Oscar Insurance Company.Insurance ›

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

PENELOPE VICTORY REID
Behavior Technician
8000 S LINCOLN ST STE 10
LITTLETON, CO 80122
Arapahoe County (720) 319-7614
ALLISON HUNTER
Behavior Analyst
8000 S LINCOLN ST STE 10
LITTLETON, CO 80122
Arapahoe County (720) 319-7614
JETT KASSAB
Behavior Technician
8000 S LINCOLN ST STE 10
LITTLETON, CO 80122
Arapahoe County (720) 319-7614
ALINA PAIGE LEYBA
Behavior Technician
8000 S LINCOLN ST STE 10
LITTLETON, CO 80122
Arapahoe County (720) 319-7614
MARIE GOLDIE DURAN
Behavior Technician
8000 S LINCOLN ST STE 10
LITTLETON, CO 80122
Arapahoe County (720) 319-7614
MARISSA OLIVAREZ
Behavior Technician
8000 S LINCOLN ST STE 10
LITTLETON, CO 80122
Arapahoe County (720) 319-7614
KIMBERLY BITTNER
Behavior Technician
8000 S LINCOLN ST STE 10
LITTLETON, CO 80122
Arapahoe County (720) 319-7614
MICHELLE LEONARD
Behavior Technician
8000 S LINCOLN ST STE 10
LITTLETON, CO 80122
Arapahoe County (720) 319-7614

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Willow Aba Services's NPI number?

The NPI number for Willow Aba Services is 1205466612. It was assigned to this organization in the NPPES registry on January 24, 2020.

Where is Willow Aba Services located?

Willow Aba Services is located at 8000 S Lincoln St Ste 10, Littleton, CO 80122. The listed phone number is (720) 316-7614.

What is Willow Aba Services's specialty?

The primary specialty registered for this NPI is Behavior Analyst with taxonomy code 103K00000X.

What insurance does Willow Aba Services accept?

Health plans from Oscar Insurance Company list Willow Aba Services as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Willow Aba Services was last updated on September 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.