Amy Haruko Matayoshi, M.D.

NPI 1417921982ActiveIndividual· Internal Medicine, Nephrology· Oceanside, CA

Internal Medicine, Nephrology (M.D.) in Oceanside, California, trained at University of Hawaii John A. Burns School of Medicine (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $494,580 for 2,574 claims, against $223,201 paid for services in 2024. Nxstage Medical, Inc. was the largest of 2 companies reporting payments in 2024, $50.38 in all, mostly food and beverage.

Overview

NPI	1417921982
Status	Active
Entity type	Individual
Credential	M.D.
Sole proprietor	No
NPI issued	Feb 14, 2006
Last updated in NPPES	Sep 23, 2026
Certified by provider	Sep 23, 2026

Specialties and licenses

Taxonomy	Code	License	State
Internal Medicine, Nephrology Primary	207RN0300X	A60790	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 - Nephrology (CA)
Accepts assignment	Yes (participating)

Medicare services in 2024

Medicare patients	261
Services billed	1,779 across 19 procedure codes
Paid by Medicare	$223,201

Part D prescriptions in 2024

Prescriptions (claims)	2,574 · 6,248 30-day fills
Patients	258
Total drug cost	$494,580
Generic share	89% of claims

Medicare sources and data years

Education and affiliations

Medical school	University of Hawaii John A. Burns School of Medicine
Graduation year	1995
Medicare specialty	Nephrology
Secondary specialties	Internal Medicine
Telehealth	Offers telehealth