Brian J. Chernak, MD

NPI 1659877330ActiveIndividual· Internal Medicine· New York, NY

Internal Medicine (MD) in New York, New York, trained at State University of New York Downstate Medical Center (class of 2018). Their prescriptions cost Medicare Part D more than their services did: $298,241 for 85 claims, against $18,884 paid for services in 2024. Geron Corporation was the largest of 2 companies reporting payments in 2025, $2,153 in all, mostly consulting fees.

Overview

NPI	1659877330
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Apr 2, 2018
Last updated in NPPES	May 31, 2024
Certified by provider	May 31, 2024

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine Primary	207R00000X	302301	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 - Hematology/Oncology (NJ); Practitioner - Hematology/Oncology (NY)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	79
Services billed	202 across 11 procedure codes
Paid by Medicare	$18,884

Part D prescriptions in 2024

Prescriptions (claims)	85 · 89 30-day fills
Patients	27
Total drug cost	$298,241
Generic share	68% of claims

Medicare sources and data years

Education and affiliations

Medical school	State University of New York Downstate Medical Center
Graduation year	2018
Medicare specialty	Hematology/Oncology
Secondary specialties	Internal Medicine
Telehealth	Offers telehealth