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Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

GEMMA D CALLAHAN
NPI 1598691065
Behavior Analyst in Warrenville, IL

Active since June 22, 2026
27555 DIEHL RD, WARRENVILLE, IL 60555(630) 281-1815 Get Directions Write a Review

NPPES record added: June 22, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Gemma D Callahan NPPES

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

GEMMA D CALLAHAN (NPI 1598691065) is an individual behavior analyst provider in Warrenville, Illinois, licensed in Illinois (152.000987) and active in the NPI registry since June 2026.

NPPES Registry Identity

NPI1598691065
Entity TypeIndividualFemale
Primary Taxonomy103K00000X
Provider Legal NameGEMMA D CALLAHAN
Location Address27555 DIEHL RDWarrenville, IL 60555-3849
Mailing Address27555 Diehl RdWarrenville, IL 60555-3849 · (630) 281-1815
Phone(630) 281-1815
Sole ProprietorNo
Enumeration DateJune 22, 2026
NPPES CertifiedJune 22, 2026
✔ NPI 1598691065 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyBehavior AnalystBehavioral Health & Social Service Providers
Taxonomy Code103K00000X
License✔ Licensed in IL · 152.000987
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.
27555 DIEHL RD, Warrenville, IL 60555
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Other Providers at the Same Location NPPES 12

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

ALEXANDRIA MARTI BARAJAS
Behavior Analyst
27555 DIEHL RD
WARRENVILLE, IL 60555
Dupage County (630) 362-5979
ABIGAIL JOYCE
Occupational Therapist
27555 DIEHL RD
WARRENVILLE, IL 60555
Dupage County (630) 355-6533
NICOL MUSIELAK M.S. CF-SLP
Speech-Language Pathologist
27555 DIEHL RD
WARRENVILLE, IL 60555
Dupage County (630) 355-6533
SYDNEY COYLE
Behavior Analyst
27555 DIEHL RD
WARRENVILLE, IL 60555
Dupage County (630) 355-6870
MS. JENNIFER WEGLOSKI CCC-SLP
Speech-Language Pathologist
27555 DIEHL RD
WARRENVILLE, IL 60555
Dupage County (630) 355-6533
CASSIDY LYNN KAPUT OTD, OTR/L
Occupational Therapist
27555 DIEHL RD
WARRENVILLE, IL 60555
Dupage County (630) 355-6533
MADISON STEELE
Speech-Language Pathologist
27555 DIEHL RD
WARRENVILLE, IL 60555
Dupage County (630) 355-6533
LITTLE FRIENDS, INC.
Day Training, Developmentally Disabled Services
27555 DIEHL RD
WARRENVILLE, IL 60555
Dupage County (630) 355-6533

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 Gemma Callahan's NPI number?

The NPI number for Gemma Callahan is 1598691065. It was assigned to this individual provider in the NPPES registry on June 22, 2026.

Where is Gemma Callahan located?

Gemma Callahan practices at 27555 Diehl Rd, Warrenville, IL 60555. The listed phone number is (630) 281-1815.

What is Gemma Callahan's specialty?

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

When was this NPI record last updated?

The NPPES record for Gemma Callahan was last updated on June 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 54 days 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.