John D. McCarthy

NPI 1679650923ActiveIndividual· Internal Medicine, Infectious Disease· Whittier, CA

Internal Medicine, Infectious Disease in Whittier, California, trained at University of California, Geffen School of Medicine (class of 1981). Their prescriptions cost Medicare Part D more than their services did: $725,578 for 1,337 claims, against $90,077 paid for services in 2024. Boston Scientific Corporation was the largest of 2 companies reporting payments in 2025, $56.66 in all, mostly food and beverage.

Overview

NPI	1679650923
Status	Active
Entity type	Individual
Sole proprietor	Yes
NPI issued	Nov 1, 2006
Last updated in NPPES	Feb 12, 2021
Certified by provider	Feb 12, 2021

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Infectious Disease Primary	207RI0200X	G49282	CA
Internal Medicine	207R00000X	G49282	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 - Infectious Disease (CA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	188
Services billed	1,176 across 13 procedure codes
Paid by Medicare	$90,077

Part D prescriptions in 2024

Prescriptions (claims)	1,337 · 1,974 30-day fills
Patients	123
Total drug cost	$725,578
Generic share	83% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of California, Geffen School of Medicine
Graduation year	1981
Medicare specialty	Infectious Disease
Secondary specialties	Internal Medicine