Timothy Raymond Larsen, D.O.
NPI 1477845337ActiveIndividual· Internal Medicine, Clinical Cardiac Electrophysiology· Chicago, IL
Internal Medicine, Clinical Cardiac Electrophysiology (D.O.) in Chicago, Illinois, trained at Michigan State University College of Osteopathic Medicine (class of 2011). Their prescriptions cost Medicare Part D more than their services did: $1,298,147 for 2,273 claims, against $189,608 paid for services in 2024. Medtronic, Inc. was the largest of 10 companies reporting payments in 2025, $10,956 in all, mostly travel and lodging.
Overview
| NPI | 1477845337 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | May 11, 2011 |
| Last updated in NPPES | Jul 23, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Clinical Cardiac Electrophysiology Primary | 207RC0001X | 036-149085 | IL |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 036-149085 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Cardiac Electrophysiology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 2,410 |
|---|---|
| Services billed | 4,474 across 59 procedure codes |
| Paid by Medicare | $189,608 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,273 · 5,816 30-day fills |
|---|---|
| Patients | 504 |
| Total drug cost | $1,298,147 |
| Generic share | 59% of claims |
Education and affiliations
| Medical school | Michigan State University College of Osteopathic Medicine |
|---|---|
| Graduation year | 2011 |
| Medicare specialty | Cardiac Electrophysiology |
| Telehealth | Offers telehealth |
Medical group
- Rush University Medical GroupChicago, IL · 1,551 clinicians
Hospital affiliations
- Advocate Illinois Masonic Medical CenterChicago, IL
- Loyola University Medical CenterMaywood, IL
- Palos Community HospitalPalos Heights, IL
- Rush Oak Park HospitalOak Park, IL
- Rush University Medical CenterChicago, IL
Industry payments (Open Payments)
- 2025$10,956 · 106 payments from 10 companies
- 2024$8,201 · 117 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medtronic, Inc. | $4,388 | 40 |
| Abbott Laboratories | $2,368 | 17 |
| Boston Scientific Corporation | $2,151 | 26 |
| Biosense Webster, Inc. | $1,269 | 13 |
| Atricure, Inc. | $245.53 | 3 |
What the 2025 payments were for
- Travel and Lodging$5,662 · 25 payments
- Food and Beverage$5,295 · 81 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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