Mark Chiawei Hwang, MD

NPI 1366798647ActiveIndividual· Internal Medicine, Rheumatology· Houston, TX

Internal Medicine, Rheumatology (MD) in Houston, Texas, trained at Saint Louis University School of Medicine (class of 2012). Their prescriptions cost Medicare Part D more than their services did: $803,528 for 311 claims, against $5,855 paid for services in 2024. Abbvie Inc. was the largest of 2 companies reporting payments in 2025, $208.23 in all, mostly food and beverage.

Overview

NPI	1366798647
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Jul 24, 2012
Last updated in NPPES	Oct 29, 2018

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Rheumatology Primary	207RR0500X	R3110	TX
Internal Medicine	207R00000X	R3110	TX

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 - Rheumatology (TX)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	37
Services billed	87 across 13 procedure codes
Paid by Medicare	$5,855

Part D prescriptions in 2024

Prescriptions (claims)	311 · 504 30-day fills
Patients	48
Total drug cost	$803,528
Generic share	65% of claims

Medicare sources and data years

Education and affiliations

Medical school	Saint Louis University School of Medicine
Graduation year	2012
Medicare specialty	Rheumatology
Secondary specialties	Internal Medicine
Telehealth	Offers telehealth