NPI Lens

Adam I. Chen, MD

NPI 1821160300ActiveIndividual· Internal Medicine, Gastroenterology· Riverside, CA

Internal Medicine, Gastroenterology (MD) in Riverside, California, trained at State University of New York at Stony Brook, School of Medicine (class of 1983). Part D covered 251 prescriptions written in 2024, 86% of them generic.

Overview

NPI1821160300
StatusActive
Entity typeIndividual
CredentialMD
Sole proprietorNo
NPI issuedNov 14, 2006
Last updated in NPPESNov 22, 2021

Specialties and licenses

TaxonomyCodeLicenseState
Internal Medicine, Gastroenterology Primary207RG0100XG61592CA

About license numbers in NPPES

Exclusion screening

ListResultDetails
HHS-OIG LEIE · Nov 10, 2026No matchChecked by NPI and by name + state
North Carolina Medicaid · Nov 11, 2026No match—
New York OMIG · Nov 11, 2026No match—
Ohio Medicaid · Nov 11, 2026No match—
Pennsylvania Medicheck · Nov 11, 2026No match—
Washington HCA · Nov 11, 2026No match—

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

Medicare

Enrollment (PECOS)Enrolled Practitioner - Internal Medicine (CA)

Part D prescriptions in 2024

Prescriptions (claims)251 · 489 30-day fills
Patients132
Total drug cost$62,301
Generic share86% of claims

Medicare sources and data years

Education and affiliations

Medical schoolState University of New York at Stony Brook, School of Medicine
Graduation year1983
Medicare specialtyInternal Medicine
Secondary specialtiesGastroenterology

Medical group

Hospital affiliation

Source: CMS Care Compare

Industry payments (Open Payments)

None reported for 2025 or 2024.

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

Other Internal Medicine, Gastroenterology providers in Riverside

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