NPI Lens

Yumiko T. Knudson, MD

NPI 1932100021ActiveIndividual· Internal Medicine, Nephrology· Muskegon, MI

Internal Medicine, Nephrology (MD) in Muskegon, Michigan, licensed in MI, with an NPI issued in August 2005. Their prescriptions cost Medicare Part D more than their services did: $304,032 for 937 claims, against $19,910 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 3 companies reporting payments in 2024, $333.32 in all, mostly food and beverage.

Overview

NPI1932100021
StatusActive
Entity typeIndividual
CredentialMD
Sole proprietorNo
NPI issuedAug 10, 2005
Last updated in NPPESApr 10, 2017

Specialties and licenses

TaxonomyCodeLicenseState
Internal Medicine, Nephrology Primary207RN0300X4301067308MI

About license numbers in NPPES

Exclusion screening

ListResultDetails
HHS-OIG LEIE · Nov 10, 2026No matchChecked by NPI and by name + state
North Carolina Medicaid · Nov 11, 2026No match—
New York OMIG · Nov 11, 2026No match—
Ohio Medicaid · Nov 11, 2026No match—
Pennsylvania Medicheck · Nov 11, 2026No match—
Washington HCA · Nov 11, 2026No match—

Official OIG search · How matching works ·Bulk check a roster

Medicare

Enrollment (PECOS)Enrolled Practitioner - Nephrology (MI)
Accepts assignmentYes (participating)

Medicare services in 2024

Medicare patients48
Services billed127 across 8 procedure codes
Paid by Medicare$19,910

Part D prescriptions in 2024

Prescriptions (claims)937 · 1,971 30-day fills
Patients132
Total drug cost$304,032
Generic share66% of claims

Medicare sources and data years

Industry payments (Open Payments)

  • 2024$333.32 · 8 payments from 3 companies

Top paying companies in 2024

CompanyAmountPayments
Astrazeneca Pharmaceuticals LP$286.216
Calliditas Therapeutics US Inc.$24.951
Daiichi Sankyo Inc.$22.161

What the 2024 payments were for

  • Food and Beverage$333.32 · 8 payments

Receiving payments does not imply wrongdoing. What Open Payments covers ·original records

Other nephrologists in Muskegon

All nephrologists in Michigan