Tara I-Hsin Chang, MD

NPI 1437166592ActiveIndividual· Internal Medicine, Nephrology· Stanford, CA

Internal Medicine, Nephrology (MD) in Stanford, California, trained at University of Michigan Medical School (class of 2003). Their prescriptions cost Medicare Part D more than their services did: $206,472 for 657 claims, against $48,901 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 4 companies reporting payments in 2025, $11,846 in all, mostly consulting fees.

Overview

NPI	1437166592
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	Yes
NPI issued	Aug 2, 2006
Last updated in NPPES	Apr 17, 2024
Certified by provider	Apr 17, 2024

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Nephrology Primary	207RN0300X	A90280	CA
Internal Medicine	207R00000X	A90280	CA

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 - Nephrology (CA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	208
Services billed	583 across 22 procedure codes
Paid by Medicare	$48,901

Part D prescriptions in 2024

Prescriptions (claims)	657 · 1,689 30-day fills
Patients	104
Total drug cost	$206,472
Generic share	78% of claims

Medicare sources and data years

Education and affiliations

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