George Ronen Nissan, DO

NPI 1245222033ActiveIndividual· Internal Medicine· Chicago, IL

Internal Medicine (DO) in Chicago, Illinois, trained at Midwestern University, Chicago College of Osteopathic Med (class of 1999). Their prescriptions cost Medicare Part D more than their services did: $197,116 for 855 claims, against $44,984 paid for services in 2024. Abbvie Inc. was the largest of 12 companies reporting payments in 2025, $14,871 in all, mostly consulting fees.

Overview

NPI	1245222033
Status	Active
Entity type	Individual
Credential	DO
Sole proprietor	No
NPI issued	Aug 17, 2005
Last updated in NPPES	Aug 8, 2025
Certified by provider	Aug 8, 2025

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine Primary	207R00000X	036108447	IL
Internal Medicine	207R00000X	L0459	TX

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 (IL); Practitioner - Internal Medicine (TX)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	87
Services billed	4,002 across 22 procedure codes
Paid by Medicare	$44,984

Part D prescriptions in 2024

Prescriptions (claims)	855 · 1,181 30-day fills
Patients	106
Total drug cost	$197,116
Generic share	80% of claims

Medicare sources and data years

Education and affiliations

Medical school	Midwestern University, Chicago College of Osteopathic Med
Graduation year	1999
Medicare specialty	Internal Medicine
Telehealth	Offers telehealth