Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Jeffrey Marker, BCBA

Behavior Analyst in Danbury, CT · enumerated 2023 · practices at All Together Licensed Behavior Analyst Pllc.

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

National Provider Identifier

1538858592

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Registry record

Entity type Individual (Type 1)

Name Jeffrey Marker

Credential BCBA

Sex Male

Practice address Danbury, CT, 06810

Phone (203) 317-9315

Enumeration date May 4, 2023

Last updated in NPPES May 4, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103K00000X Behavior Analyst Behavioral Health & Social Service Providers 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.

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Frequently asked questions

How do I verify Jeffrey Marker's NPI record?

Cross-check NPI 1538858592 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1538858592 active?

Yes, as of the latest NPPES snapshot, NPI 1538858592 is active (record last updated 2023-05-04).

Other providers at this practice address

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Alison Kuchta Clinical Social Worker · Danbury, CT NPI 1730398983 Julianna Flagg Behavior Analyst · Danbury, CT NPI 1609327758 All Together Licensed Behavior Analyst Pllc Behavior Analyst · Danbury, CT NPI 1003573973 Timothy Gordon Social Worker · Danbury, CT NPI 1386324572

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-05-04.