William C. Koonce, MD

NPI 1124010095ActiveIndividual· Internal Medicine· Santa Barbara, CA

Internal Medicine (MD) in Santa Barbara, California, trained at University of California, Irvine, California College of Medicine (class of 1985). Their prescriptions cost Medicare Part D more than their services did: $943,669 for 8,873 claims, against $396,789 paid for services in 2024. Amgen Inc. was the largest of 14 companies reporting payments in 2025, $1,024 in all, mostly food and beverage.

Overview

NPI	1124010095
Status	Active
Entity type	Individual
Credential	MD
Sole proprietor	Yes
NPI issued	Aug 17, 2005
Last updated in NPPES	Sep 9, 2010

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine Primary	207R00000X	G58414	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	571
Services billed	7,810 across 61 procedure codes
Paid by Medicare	$396,789

Part D prescriptions in 2024

Prescriptions (claims)	8,873 · 14,479 30-day fills
Patients	468
Total drug cost	$943,669
Generic share	84% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of California, Irvine, California College of Medicine
Graduation year	1985
Medicare specialty	Internal Medicine
Secondary specialties	Diagnostic Radiology