William H. Holderman, M.D.

NPI 1346213956ActiveIndividual· Internal Medicine, Gastroenterology· Tacoma, WA

Internal Medicine, Gastroenterology (M.D.) in Tacoma, Washington, trained at R Franklin University of Med & Sci/Chicago Medical School (class of 1987). Their prescriptions cost Medicare Part D more than their services did: $1,015,196 for 883 claims, against $63,861 paid for services in 2024. Celltrion USA Inc. was the largest of 15 companies reporting payments in 2025, $22,794 in all, mostly honoraria.

Overview

NPI	1346213956
Status	Active
Entity type	Individual
Credential	M.D.
Sole proprietor	No
NPI issued	Feb 13, 2006
Last updated in NPPES	Apr 4, 2014

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Gastroenterology Primary	207RG0100X	MD00030625	WA

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 - Gastroenterology (WA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	383
Services billed	632 across 26 procedure codes
Paid by Medicare	$63,861

Part D prescriptions in 2024

Prescriptions (claims)	883 · 1,343 30-day fills
Patients	388
Total drug cost	$1,015,196
Generic share	71% of claims

Medicare sources and data years

Education and affiliations

Medical school	R Franklin University of Med & Sci/Chicago Medical School
Graduation year	1987
Medicare specialty	Gastroenterology
Telehealth	Offers telehealth