Timothy Chan Chang, MD

NPI 1437594496ActiveIndividual· Urology· Stanford, CA

Urology (MD) in Stanford, California, trained at Stanford University School of Medicine (class of 2013). 255 Medicare patients in 2024, $83,578 paid; nearly all of their 160 Part D prescriptions were generic (94%). Janssen Biotech, Inc. was the largest of 2 companies reporting payments in 2025, $180.16 in all, mostly food and beverage.

Overview

NPI	1437594496
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	Yes
NPI issued	May 5, 2013
Last updated in NPPES	Mar 13, 2024
Certified by provider	Mar 13, 2024

Specialties and licenses

Taxonomy	Code	License	State
Urology Primary	208800000X	A131727	CA
Surgery	208600000X	A131727	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 4, 2026	No match	—
New York OMIG · Nov 4, 2026	No match	—
Ohio Medicaid · Nov 4, 2026	No match	—
Pennsylvania Medicheck · Nov 4, 2026	No match	—
Washington HCA · Nov 4, 2026	No match	—

Official OIG search · How matching works ·Bulk check a roster

Medicare

Enrollment (PECOS)	Enrolled Practitioner - Urology (CA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	255
Services billed	920 across 50 procedure codes
Paid by Medicare	$83,578

Part D prescriptions in 2024

Prescriptions (claims)	160 · 283 30-day fills
Patients	80
Total drug cost	$10,691
Generic share	94% of claims

Medicare sources and data years

Education and affiliations

Medical school	Stanford University School of Medicine
Graduation year	2013
Medicare specialty	Urology
Secondary specialties	General Surgery
Telehealth	Offers telehealth