Patrick Koo, MD

NPI 1801152772ActiveIndividual· Internal Medicine, Gastroenterology· Fullerton, CA

Internal Medicine, Gastroenterology (MD) in Fullerton, California, trained at Pennsylvania State University College of Medicine (class of 2012). Their prescriptions cost Medicare Part D more than their services did: $741,200 for 1,246 claims, against $146,350 paid for services in 2024. Abbvie Inc. was the largest of 16 companies reporting payments in 2025, $1,709 in all, mostly food and beverage.

Overview

NPI	1801152772
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Apr 5, 2012
Last updated in NPPES	Oct 22, 2024
Certified by provider	Oct 22, 2024

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	A136521	CA

About license numbers in NPPES

Exclusion screening

List	Result	Details
HHS-OIG LEIE · Oct 9, 2026	No match	Checked by NPI and by name + state
North Carolina Medicaid · Nov 10, 2026	No match	—
New York OMIG · Nov 10, 2026	No match	—
Ohio Medicaid · Nov 10, 2026	No match	—
Pennsylvania Medicheck · Nov 10, 2026	No match	—
Washington HCA · Nov 10, 2026	No match	—

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

Medicare

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

Medicare services in 2024

Medicare patients	512
Services billed	1,402 across 50 procedure codes
Paid by Medicare	$146,350

Part D prescriptions in 2024

Prescriptions (claims)	1,246 · 2,820 30-day fills
Patients	427
Total drug cost	$741,200
Generic share	85% of claims

Medicare sources and data years

Education and affiliations

Medical school	Pennsylvania State University College of Medicine
Graduation year	2012
Medicare specialty	Internal Medicine
Secondary specialties	Gastroenterology
Telehealth	Offers telehealth