William E. Karnes Jr., MD

NPI 1881652998ActiveIndividual· Internal Medicine, Gastroenterology· Orange, CA

Internal Medicine, Gastroenterology (MD) in Orange, California, trained at University of Minnesota Medical School (class of 1982). Their prescriptions cost Medicare Part D more than their services did: $342,589 for 1,323 claims, against $112,962 paid for services in 2024. Capsovision, Inc. reported $103.96 in payments in 2025, mostly food and beverage.

Overview

NPI	1881652998
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	Yes
NPI issued	May 1, 2006
Last updated in NPPES	Sep 8, 2014

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	G57458	CA

About license numbers in NPPES

Exclusion screening

List	Result	Details
HHS-OIG LEIE · Oct 9, 2026	No match	Checked by NPI and by name + state
North Carolina Medicaid · Nov 10, 2026	No match	—
New York OMIG · Nov 10, 2026	No match	—
Ohio Medicaid · Nov 10, 2026	No match	—
Pennsylvania Medicheck · Nov 10, 2026	No match	—
Washington HCA · Nov 10, 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	580
Services billed	894 across 35 procedure codes
Paid by Medicare	$112,962

Part D prescriptions in 2024

Prescriptions (claims)	1,323 · 2,504 30-day fills
Patients	553
Total drug cost	$342,589
Generic share	78% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of Minnesota Medical School
Graduation year	1982
Medicare specialty	Internal Medicine
Secondary specialties	Gastroenterology
Telehealth	Offers telehealth