Donny Li-Fan Chang, M.D., PH.D.

NPI 1114188265ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Leominster, MA

Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D., PH.D.) in Leominster, Massachusetts, trained at Boston University School of Medicine (class of 2008). Their prescriptions cost Medicare Part D more than their services did: $817,317 for 1,854 claims, against $56,158 paid for services in 2024. Medtronic, Inc. reported $23.05 in payments in 2024, mostly food and beverage.

Overview

NPI	1114188265
Status	Active
Entity type	Individual
Credential	M.D., PH.D.
Sole proprietor	No
NPI issued	Jun 21, 2008
Last updated in NPPES	Dec 13, 2018

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Endocrinology, Diabetes & Metabolism Primary	207RE0101X	254814	MA

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 - Endocrinology (MA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	295
Services billed	733 across 10 procedure codes
Paid by Medicare	$56,158

Part D prescriptions in 2024

Prescriptions (claims)	1,854 · 4,071 30-day fills
Patients	274
Total drug cost	$817,317
Generic share	43% of claims

Medicare sources and data years

Education and affiliations

Medical school	Boston University School of Medicine
Graduation year	2008
Medicare specialty	Endocrinology
Secondary specialties	Internal Medicine
Telehealth	Offers telehealth