Mary-Elizabeth Muchmore Percival, M.D.

NPI 1225278955ActiveIndividual· Internal Medicine, Hematology· Seattle, WA

Internal Medicine, Hematology (M.D.) in Seattle, Washington, trained at Stanford University School of Medicine (class of 2007). Their prescriptions cost Medicare Part D more than their services did: $266,372 for 50 claims, against $24,510 paid for services in 2024. Taiho Oncology, Inc. was the largest of 2 companies reporting payments in 2025, $437.57 in all, mostly compensation for serving as faculty or as a speaker for a me.

Overview

NPI	1225278955
Status	Active
Entity type	Individual
Credential	M.D.
Sole proprietor	No
NPI issued	Feb 20, 2009
Last updated in NPPES	Oct 29, 2015

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Hematology Primary	207RH0000X	MD.MD.60591746	WA
Internal Medicine	207R00000X	A106581	CA
Internal Medicine, Hematology & Oncology	207RH0003X	A106581	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 - Hematology (WA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	78
Services billed	273 across 10 procedure codes
Paid by Medicare	$24,510

Part D prescriptions in 2024

Prescriptions (claims)	50 · 58 30-day fills
Patients	17
Total drug cost	$266,372
Generic share	60% of claims

Medicare sources and data years

Education and affiliations

Medical school	Stanford University School of Medicine
Graduation year	2007
Medicare specialty	Hematology
Secondary specialties	Hematology/Oncology
Telehealth	Offers telehealth