Young J. Ko, MD

NPI 1639277130ActiveIndividual· Internal Medicine· Lancaster, CA

Internal Medicine (MD) with Av Critical Care Inc, practicing in Lancaster, California. Their prescriptions cost Medicare Part D more than their services did: $1,342,901 for 5,300 claims, against $365,731 paid for services in 2024. Intuitive Surgical, Inc. was the largest of 2 companies reporting payments in 2025, $7,873 in all, mostly education. Lists Antelope Valley Hospital and 1 other hospital as hospital affiliations.

Overview

NPI	1639277130
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	No
NPI issued	Sep 20, 2006
Last updated in NPPES	Sep 11, 2025

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine Primary	207R00000X	A39814	CA
Internal Medicine, Critical Care Medicine	207RC0200X	A39814	CA
Internal Medicine, Pulmonary Disease	207RP1001X	A39814	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	639
Services billed	5,192 across 45 procedure codes
Paid by Medicare	$365,731

Part D prescriptions in 2024

Prescriptions (claims)	5,300 · 9,681 30-day fills
Patients	496
Total drug cost	$1,342,901
Generic share	70% of claims

Medicare sources and data years

Education and affiliations

Graduation year	1973
Medicare specialty	Internal Medicine
Secondary specialties	Critical Care (Intensivists), Pulmonary Disease, Sleep Medicine
Telehealth	Offers telehealth