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KELSEY MARIE NIELSEN
NPI 1407329493
Behavior Analyst in San Diego, CA

Active since January 02, 2019
3731 6TH AVE STE 100, SAN DIEGO, CA 92103(855) 223-7123 Get Directions Write a Review

NPPES record last updated: September 18, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Sep 18, 2025, Jan 2, 2019 (2 updates tracked since 2019).

About Kelsey Marie Nielsen NPPES

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

KELSEY MARIE NIELSEN (NPI 1407329493) is an individual behavior analyst provider in San Diego, California, licensed in California (1-23-66175) and active in the NPI registry since January 2019.

NPPES Registry Identity

NPI1407329493
Entity TypeIndividualFemale
Primary Taxonomy103K00000X
Provider Legal NameKELSEY MARIE NIELSEN
Location Address3731 6TH AVE STE 100San Diego, CA 92103-4383
Mailing Address16782 Von Karman Ave Ste 11Irvine, CA 92606-2417 · (855) 223-7123
Phone(855) 223-7123
Sole ProprietorNo
Enumeration DateJanuary 2, 2019
Last NPPES UpdateSeptember 18, 20252 updates tracked since enumeration
NPPES CertifiedSeptember 18, 2025
✔ NPI 1407329493 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 CA · 1-23-66175
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.
3731 6TH AVE STE 100, San Diego, CA 92103
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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.

MEGAN CARBERRY
Social Worker (School)
3731 6TH AVE STE 100
SAN DIEGO, CA 92103
San Diego County (855) 223-7123
AMANDA ROSS
Behavior Technician
3731 6TH AVE STE 100
SAN DIEGO, CA 92103
San Diego County (855) 223-7123
BEVERLY KIABETH CASTILLO
Behavior Technician
3731 6TH AVE STE 100
SAN DIEGO, CA 92103
San Diego County (619) 278-0884
MS. LISA CHRISTINE WALKER M.CL.SC., CCC-SLP
Speech-Language Pathologist
3731 6TH AVE STE 100
SAN DIEGO, CA 92103
San Diego County (619) 694-6579
CANDICE RYAN BCBA, NCLBA
Behavior Analyst
3731 6TH AVE STE 100
SAN DIEGO, CA 92103
San Diego County (619) 278-0884
JESSICA SIEFERT BCABA
Behavior Analyst
3731 6TH AVE STE 100
SAN DIEGO, CA 92103
San Diego County (619) 278-0884
MELISSA MORENA-GARCIA
Behavior Technician
3731 6TH AVE STE 100
SAN DIEGO, CA 92103
San Diego County (855) 223-7123
ELIZABETH ROSALES RAMIREZ
Behavior Technician
3731 6TH AVE STE 100
SAN DIEGO, CA 92103
San Diego County (855) 223-7123

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 Kelsey Nielsen's NPI number?

The NPI number for Kelsey Nielsen is 1407329493. It was assigned to this individual provider in the NPPES registry on January 2, 2019.

Where is Kelsey Nielsen located?

Kelsey Nielsen practices at 3731 6th Ave Ste 100, San Diego, CA 92103. The listed phone number is (855) 223-7123.

What is Kelsey Nielsen'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 Kelsey Nielsen was last updated on September 18, 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.