Mark Patrick Cahill, MD

NPI 1598957888ActiveIndividual· Internal Medicine, Gastroenterology· Tualatin, OR

Internal Medicine, Gastroenterology (MD) in Tualatin, Oregon, trained at University of Washington School of Medicine (class of 2006). Their prescriptions cost Medicare Part D more than their services did: $476,099 for 571 claims, against $72,939 paid for services in 2024. Abbvie Inc. reported $28.57 in payments in 2025, mostly food and beverage.

Overview

NPI	1598957888
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Aug 10, 2007
Last updated in NPPES	Nov 28, 2023
Certified by provider	Nov 28, 2023

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	MD29414	OR

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 (OR)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	197
Services billed	3,030 across 46 procedure codes
Paid by Medicare	$72,939

Part D prescriptions in 2024

Prescriptions (claims)	571 · 890 30-day fills
Patients	233
Total drug cost	$476,099
Generic share	81% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of Washington School of Medicine
Graduation year	2006
Medicare specialty	Internal Medicine
Secondary specialties	Gastroenterology
Telehealth	Offers telehealth