Mark R. Fantaski, MD

NPI 1689651630ActiveIndividual· Internal Medicine· Gibsonia, PA

Internal Medicine (MD) in Gibsonia, Pennsylvania, trained at Jefferson Medical College of Thomas Jefferson University (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $930,742 for 11,608 claims, against $70,357 paid for services in 2024. Eisai Inc. was the largest of 4 companies reporting payments in 2025, $390.21 in all, mostly food and beverage.

Overview

NPI	1689651630
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Dec 29, 2005
Last updated in NPPES	Jan 14, 2008

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine Primary	207R00000X	MD048987L	PA

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 (PA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	272
Services billed	1,210 across 39 procedure codes
Paid by Medicare	$70,357

Part D prescriptions in 2024

Prescriptions (claims)	11,608 · 28,370 30-day fills
Patients	1,027
Total drug cost	$930,742
Generic share	90% of claims

Medicare sources and data years

Education and affiliations

Medical school	Jefferson Medical College of Thomas Jefferson University
Graduation year	1990
Medicare specialty	Internal Medicine
Telehealth	Offers telehealth