Mark S. Okonski, MD

NPI 1952393209ActiveIndividual· Internal Medicine, Gastroenterology· Port Matilda, PA

Internal Medicine, Gastroenterology (MD) with Geisinger Clinic, practicing in Port Matilda, Pennsylvania. Medicare paid $12,966 for services to 74 patients in 2024. Lists Geisinger-Lewistown Hospital as a hospital affiliation.

Overview

NPI	1952393209
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Aug 22, 2005
Last updated in NPPES	Nov 3, 2025
Certified by provider	Nov 3, 2025

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	MD488012	PA
Internal Medicine, Gastroenterology	207RG0100X	71344	TN

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 (CO); Practitioner - Gastroenterology (PA); Practitioner - Internal Medicine (SC); Practitioner - Gastroenterology (TN)
Accepts assignment	Yes (participating)