Mark R. Johnson, M.D.

NPI 1578670931ActiveIndividual· Internal Medicine, Nephrology· Morristown, NJ

Internal Medicine, Nephrology (M.D.) in Morristown, New Jersey, trained at New York University School of Medicine (class of 2003). In 2024 Medicare paid $181,533 for 592 patients, and Part D covered 327 of their prescriptions, 87% of them generic. Bayer Healthcare Pharmaceuticals Inc. was the largest of 4 companies reporting payments in 2025, $184.28 in all, mostly food and beverage.

Overview

NPI	1578670931
Status	Active
Entity type	Individual
Credential	M.D.
Sole proprietor	No
NPI issued	Aug 23, 2006
Last updated in NPPES	Jan 7, 2010

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Nephrology Primary	207RN0300X	25MA08685600	NJ
Internal Medicine	207R00000X	25MA08685600	NJ

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 - Nephrology (NJ)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	592
Services billed	1,945 across 14 procedure codes
Paid by Medicare	$181,533

Part D prescriptions in 2024

Prescriptions (claims)	327 · 812 30-day fills
Patients	81
Total drug cost	$54,193
Generic share	87% of claims

Medicare sources and data years

Education and affiliations

Medical school	New York University School of Medicine
Graduation year	2003
Medicare specialty	Nephrology
Secondary specialties	Internal Medicine
Telehealth	Offers telehealth