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David Bao-Long Duong, MD

NPI 1821471210ActiveIndividual· Internal Medicine· Boston, MA

Internal Medicine (MD) in Boston, Massachusetts, trained at Harvard Medical School (class of 2015). Their prescriptions cost Medicare Part D more than their services did: $241,498 for 1,423 claims, against $5,449 paid for services in 2024. Merck Kgaa was the largest of 2 companies reporting payments in 2025, $7,245 in all, mostly travel and lodging.

Overview

NPI1821471210
StatusActive
Entity typeIndividual
CredentialMD
Sole proprietorNo
NPI issuedJul 2, 2015
Last updated in NPPESNov 6, 2019

Specialties and licenses

TaxonomyCodeLicenseState
Internal Medicine Primary207R00000X279752MA
Internal Medicine207R00000X264259MA

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 10, 2026No match—
New York OMIG · Nov 10, 2026No match—
Ohio Medicaid · Nov 10, 2026No match—
Pennsylvania Medicheck · Nov 10, 2026No match—
Washington HCA · Nov 10, 2026No match—

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

Medicare

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

Medicare services in 2024

Medicare patients42
Services billed100 across 3 procedure codes
Paid by Medicare$5,449

Part D prescriptions in 2024

Prescriptions (claims)1,423 · 2,704 30-day fills
Patients104
Total drug cost$241,498
Generic share82% of claims

Medicare sources and data years

Education and affiliations

Medical schoolHarvard Medical School
Graduation year2015
Medicare specialtyInternal Medicine

Medical group

Hospital affiliation

Other facilities

Source: CMS Care Compare

Industry payments (Open Payments)

  • 2025$7,245 · 10 payments from 2 companies
  • 2024$367.24 · 2 payments from 1 company

Top paying companies in 2025

CompanyAmountPayments
Merck Kgaa$6,9888
Merck Healthcare Kgaa$257.832

What the 2025 payments were for

  • Travel and Lodging$3,659 · 7 payments
  • Consulting Fee$3,500 · 1 payment
  • Food and Beverage$85.93 · 2 payments

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

Other Internal Medicine providers in Boston

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