Sy H. Oang, D.O.

NPI 1972692937ActiveIndividual· Internal Medicine· Whittier, CA

Internal Medicine (D.O.) in Whittier, California, trained at Michigan State University College of Osteopathic Medicine (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $612,355 for 8,658 claims, against $46,433 paid for services in 2024. Astrazeneca Pharmaceuticals LP reported $15.99 in payments in 2025, mostly education.

Overview

NPI	1972692937
Status	Active
Entity type	Individual
Credential	D.O.
Sole proprietor	No
NPI issued	Oct 11, 2006
Last updated in NPPES	Mar 13, 2008

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine Primary	207R00000X	20A6673	CA

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 - Internal Medicine (CA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	173
Services billed	608 across 35 procedure codes
Paid by Medicare	$46,433

Part D prescriptions in 2024

Prescriptions (claims)	8,658 · 22,421 30-day fills
Patients	654
Total drug cost	$612,355
Generic share	89% of claims

Medicare sources and data years

Education and affiliations

Medical school	Michigan State University College of Osteopathic Medicine
Graduation year	1991
Medicare specialty	Internal Medicine
Telehealth	Offers telehealth