NPI Lens

Huong T. Duong, M.D.

NPI 1013020437ActiveIndividual· Internal Medicine· Tustin, CA

Internal Medicine (M.D.) in Tustin, California, trained at University of California, San Francisco School of Medicine (class of 1984). Their prescriptions cost Medicare Part D more than their services did: $261,650 for 4,219 claims, against $145,696 paid for services in 2024. Lilly USA, LLC was the largest of 10 companies reporting payments in 2025, $495.22 in all, mostly food and beverage.

Overview

NPI1013020437
StatusActive
Entity typeIndividual
CredentialM.D.
Sole proprietorNo
NPI issuedAug 17, 2006
Last updated in NPPESJun 10, 2011

Specialties and licenses

TaxonomyCodeLicenseState
Internal Medicine Primary207R00000XG56794CA

About license numbers in NPPES

Exclusion screening

ListResultDetails
HHS-OIG LEIE · Oct 9, 2026No matchChecked by NPI and by name + state
North Carolina Medicaid · Nov 4, 2026No match—
New York OMIG · Nov 4, 2026No match—
Ohio Medicaid · Nov 4, 2026No match—
Pennsylvania Medicheck · Nov 4, 2026No match—
Washington HCA · Nov 4, 2026No match—

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

Medicare

Enrollment (PECOS)Enrolled Practitioner - Internal Medicine (CA)
Accepts assignmentYes (participating)

Medicare services in 2024

Medicare patients273
Services billed1,781 across 41 procedure codes
Paid by Medicare$145,696

Part D prescriptions in 2024

Prescriptions (claims)4,219 · 10,190 30-day fills
Patients363
Total drug cost$261,650
Generic share90% of claims

Medicare sources and data years

Education and affiliations

Medical schoolUniversity of California, San Francisco School of Medicine
Graduation year1984
Medicare specialtyInternal Medicine

Medical group

Hospital affiliations

Other facilities

Source: CMS Care Compare

Industry payments (Open Payments)

  • 2025$495.22 · 20 payments from 10 companies
  • 2024$523.29 · 19 payments from 10 companies

Top paying companies in 2025

CompanyAmountPayments
Lilly USA, LLC$113.366
Boehringer Ingelheim Pharmaceuticals, Inc.$95.054
Janssen Pharmaceuticals, Inc$75.252
Balt USA, LLC$55.151
Glaxosmithkline, LLC.$44.312

What the 2025 payments were for

  • Food and Beverage$495.22 · 20 payments

Receiving payments does not imply wrongdoing. What Open Payments covers ·original records

Other Internal Medicine providers in Tustin

All Internal Medicine providers in California →