Johnny Tzer-Ren Chang, MD

NPI 1417175258ActiveIndividual· Plastic Surgery· Palo Alto, CA

Plastic Surgery (MD) in Palo Alto, California, trained at Tufts University School of Medicine (class of 2006). Mostly services rather than prescriptions: Medicare paid $36,443 for 45 patients in 2024, with only 42 Part D claims. Astrazeneca Pharmaceuticals LP reported $107.82 in payments in 2024, mostly food and beverage.

Overview

NPI	1417175258
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	Yes
NPI issued	Apr 24, 2007
Last updated in NPPES	May 28, 2020
Certified by provider	May 28, 2020

Specialties and licenses

Taxonomy	Code	License	State
Plastic Surgery Primary	208200000X	A121316	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 - Plastic and Reconstructive Surgery (CA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	45
Services billed	161 across 44 procedure codes
Paid by Medicare	$36,443

Part D prescriptions in 2024

Prescriptions (claims)	42 · 106 30-day fills
Patients	17
Total drug cost	$4,834
Generic share	93% of claims

Medicare sources and data years

Education and affiliations

Medical school	Tufts University School of Medicine
Graduation year	2006
Medicare specialty	Plastic And Reconstructive Surgery
Secondary specialties	Hand Surgery