Matthew O. Horowitz, M.D.

NPI 1225110901ActiveIndividual· Internal Medicine, Gastroenterology· Great Neck, NY

Internal Medicine, Gastroenterology (M.D.) in Great Neck, New York, trained at State University of New York at Stony Brook, School of Medicine (class of 1992). 440 Medicare patients in 2024, $183,042 paid; nearly all of their 2,424 Part D prescriptions were generic (91%). Madrigal Pharmaceuticals was the largest of 2 companies reporting payments in 2024, $160.38 in all, mostly food and beverage.

Overview

NPI	1225110901
Status	Active
Entity type	Individual
Credential	M.D.
Sole proprietor	No
NPI issued	Oct 20, 2006
Last updated in NPPES	Dec 3, 2009

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	197394	NY

About license numbers in NPPES

Exclusion screening

List	Result	Details
HHS-OIG LEIE · Nov 10, 2026	No match	Checked by NPI and by name + state
North Carolina Medicaid · Nov 11, 2026	No match	—
New York OMIG · Nov 11, 2026	No match	—
Ohio Medicaid · Nov 11, 2026	No match	—
Pennsylvania Medicheck · Nov 11, 2026	No match	—
Washington HCA · Nov 11, 2026	No match	—

Official OIG search · How matching works ·Bulk check a roster

Medicare

Enrollment (PECOS)	Enrolled Practitioner - Internal Medicine (NY)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	440
Services billed	1,341 across 38 procedure codes
Paid by Medicare	$183,042

Part D prescriptions in 2024

Prescriptions (claims)	2,424 · 5,092 30-day fills
Patients	415
Total drug cost	$223,811
Generic share	91% of claims

Medicare sources and data years

Education and affiliations

Medical school	State University of New York at Stony Brook, School of Medicine
Graduation year	1992
Medicare specialty	Internal Medicine
Secondary specialties	Gastroenterology
Telehealth	Offers telehealth