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Nathan Russell Ayer, M.D., M.P.H.

NPI 1457361172ActiveIndividual· Internal Medicine· Loveland, CO

Internal Medicine (M.D., M.P.H.) in Loveland, Colorado, trained at University of Rochester School of Medicine and Dentistry (class of 2001). Their prescriptions cost Medicare Part D more than their services did: $968,986 for 10,251 claims, against $104,163 paid for services in 2024.

Overview

NPI1457361172
StatusActive
Entity typeIndividual
CredentialM.D., M.P.H.
Sole proprietorNo
NPI issuedAug 8, 2006
Last updated in NPPESJul 24, 2015

Specialties and licenses

TaxonomyCodeLicenseState
Internal Medicine Primary207R00000XDR.0054301CO
Internal Medicine207R00000X042-00010678VT

About license numbers in NPPES

Exclusion screening

ListResultDetails
HHS-OIG LEIE · Oct 9, 2026No matchChecked by NPI and by name + state
North Carolina Medicaid · Nov 10, 2026No match—
New York OMIG · Nov 10, 2026No match—
Ohio Medicaid · Nov 10, 2026No match—
Pennsylvania Medicheck · Nov 10, 2026No match—
Washington HCA · Nov 10, 2026No match—

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

Medicare

Enrollment (PECOS)Enrolled Practitioner - Internal Medicine (CO)
Accepts assignmentYes (participating)

Medicare services in 2024

Medicare patients514
Services billed2,131 across 47 procedure codes
Paid by Medicare$104,163

Part D prescriptions in 2024

Prescriptions (claims)10,251 · 25,897 30-day fills
Patients781
Total drug cost$968,986
Generic share89% of claims

Medicare sources and data years

Education and affiliations

Medical schoolUniversity of Rochester School of Medicine and Dentistry
Graduation year2001
Medicare specialtyInternal Medicine
TelehealthOffers telehealth

Medical groups

Hospital affiliations

Other facilities

Source: CMS Care Compare

Industry payments (Open Payments)

None reported for 2025 or 2024.

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

Other Internal Medicine providers in Loveland

All Internal Medicine providers in Colorado →