Michael Brian Maris, MD

NPI 1053395624ActiveIndividual· Internal Medicine, Hematology & Oncology· Denver, CO

Internal Medicine, Hematology & Oncology (MD) in Denver, Colorado, trained at Perelman School of Med at the University of Pennsylvania (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $3,702,619 for 1,164 claims, against $742,011 paid for services in 2024. Abbvie Inc. was the largest of 7 companies reporting payments in 2025, $634.14 in all, mostly food and beverage.

Overview

NPI	1053395624
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Dec 6, 2005
Last updated in NPPES	Oct 1, 2013

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Hematology & Oncology Primary	207RH0003X	43475	CO

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 - Hematopoietic Cell Transplantation and Cellular Therapy (CO); Practitioner - Hematology/Oncology (WY)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	225
Services billed	35,915 across 83 procedure codes
Paid by Medicare	$742,011

Part D prescriptions in 2024

Prescriptions (claims)	1,164 · 1,521 30-day fills
Patients	75
Total drug cost	$3,702,619
Generic share	72% of claims

Medicare sources and data years

Education and affiliations

Medical school	Perelman School of Med at the University of Pennsylvania
Graduation year	1995
Medicare specialty	Hematopoietic Cell Transplantation And Cellular Therapy
Secondary specialties	Hematology/Oncology
Telehealth	Offers telehealth