Mark Allen Rosen, MD

NPI 1427108851ActiveIndividual· Internal Medicine, Critical Care Medicine· Orange, CA

Internal Medicine, Critical Care Medicine (MD) in Orange, California, trained at Loyola University of Chicago, Stritch School of Medicine (class of 1979). Medicare paid $20,576 for services to 57 patients in 2024. Abiomed was the largest of 2 companies reporting payments in 2025, $67.02 in all, mostly food and beverage.

Overview

NPI	1427108851
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	Yes
NPI issued	Jan 10, 2007
Last updated in NPPES	Jul 8, 2007

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Critical Care Medicine Primary	207RC0200X	G43522	CA

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 (CA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	57
Services billed	129 across 10 procedure codes
Paid by Medicare	$20,576

Medicare sources and data years

Education and affiliations

Medical school	Loyola University of Chicago, Stritch School of Medicine
Graduation year	1979
Medicare specialty	Internal Medicine
Secondary specialties	Pulmonary Disease