Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MARK L. HENDERSON LCSW
NPI 1083606826
Social Worker - Clinical in Poughkeepsie, NY

Active since August 18, 2005
29 N HAMILTON ST, POUGHKEEPSIE, NY 12601(845) 452-1110(845) 452-1119 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Mark L. Henderson Lcsw NPPES

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

MARK L. HENDERSON LCSW (NPI 1083606826) is an individual clinical provider in Poughkeepsie, New York, licensed in New York (PR026381-1) and active in the NPI registry since August 2005.

NPPES Registry Identity

NPI1083606826
Entity TypeIndividualMale
Primary Taxonomy1041C0700X
Provider Legal NameMARK L. HENDERSONCredential: LCSW
Location Address29 N HAMILTON STPoughkeepsie, NY 12601-2541
Mailing Address29 N Hamilton StPoughkeepsie, NY 12601-2541 · (845) 452-1110 · Fax (845) 452-1119
Fax(845) 452-1119
Sole ProprietorNo
Enumeration DateAugust 18, 2005
Last NPPES UpdateJuly 13, 2026
NPI 1083606826 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

Primary SpecialtySocial Worker · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code1041C0700X
License Licensed in NY · PR026381-1
Definition
A social worker who holds a master's or doctoral degree in social work from an accredited school of social work in addition to at least two years of post-master's supervised experience in a clinical setting. The social worker must be licensed, certified, or registered at the clinical level in the jurisdiction of practice. A clinical social worker provides direct services, including interventions focused on interpersonal interactions, intrapsychic dynamics, and life management issues. Clinical social work services are based on bio-psychosocial perspectives. Services consist of assessment, diagnosis, treatment (including psychotherapy and counseling), client-centered advocacy, consultation, evaluation, and prevention of mental illness, emotional, or behavioral disturbances.
29 N HAMILTON ST, Poughkeepsie, NY 12601

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.

Social Worker (Clinical)
29 N HAMILTON ST
POUGHKEEPSIE, NY 12601
Family Medicine
29 N HAMILTON ST, HUDSON RIVER HEALTHCARE, INC.
POUGHKEEPSIE, NY 12601
Counselor (Addiction (Substance Use Disorder))
29 N HAMILTON ST
POUGHKEEPSIE, NY 12601
Social Worker
29 N HAMILTON ST
POUGHKEEPSIE, NY 12601
Counselor (Addiction (Substance Use Disorder))
29 N HAMILTON ST
POUGHKEEPSIE, NY 12601
Dental Hygienist
29 N HAMILTON ST, HUDSON RIVER HEALTHCARE, INC.
POUGHKEEPSIE, NY 12601
Counselor (Mental Health)
29 N HAMILTON ST
POUGHKEEPSIE, NY 12601
Social Worker
29 N HAMILTON ST, SUITE 209
POUGHKEEPSIE, NY 12601

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 Mark Henderson's NPI number?

The NPI number for Mark Henderson is 1083606826. It was assigned to this individual provider in the NPPES registry on August 18, 2005.

Where is Mark Henderson located?

Mark Henderson practices at 29 N Hamilton St, Poughkeepsie, NY 12601. The listed phone number is (845) 452-1110.

What is Mark Henderson's specialty?

The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.

When was this NPI record last updated?

The NPPES record for Mark Henderson was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 31 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.