John Dean Klemperer, MD
NPI 1457337172ActiveIndividual· Thoracic Surgery (Cardiothoracic Vascular Surgery)· Bangor, ME
Thoracic Surgery (Cardiothoracic Vascular Surgery) (MD) in Bangor, Maine, trained at State University of New York at Buffalo School of Medicine (class of 1990). Mostly services rather than prescriptions: Medicare paid $97,370 for 100 patients in 2024, with only 27 Part D claims. Atricure, Inc. was the largest of 5 companies reporting payments in 2025, $10,612 in all, mostly consulting fees.
Overview
| NPI | 1457337172 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Dec 15, 2005 |
| Last updated in NPPES | Apr 9, 2020 |
| Certified by provider | Apr 9, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Thoracic Surgery (Cardiothoracic Vascular Surgery) Primary | 208G00000X | 015166 | ME |
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 Surgery (ME) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 100 |
|---|---|
| Services billed | 258 across 48 procedure codes |
| Paid by Medicare | $97,370 |
Part D prescriptions in 2024
| Prescriptions (claims) | 27 · 27 30-day fills |
|---|---|
| Patients | 15 |
| Total drug cost | $1,019 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | State University of New York at Buffalo School of Medicine |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Cardiac Surgery |
| Secondary specialties | Thoracic Surgery |
| Telehealth | Offers telehealth |
Medical group
- Eastern Maine Medical CenterBangor, ME · 624 clinicians
Hospital affiliations
- Calais Community HospitalCalais, ME
- Northern Light A R Gould HospitalPresque Isle, ME
- Northern Light Eastern Maine Medical CenterBangor, ME
- Northern Light Sebasticook Valley HospitalPittsfield, ME
- Northern Maine Medical CenterFort Kent, ME
Other facilities
- Northern Light Home Care & HospiceHome health agency · So Portland, ME
Industry payments (Open Payments)
- 2025$10,612 · 14 payments from 5 companies
- 2024$10,287 · 15 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Atricure, Inc. | $8,888 | 5 |
| Astrazeneca Pharmaceuticals LP | $1,446 | 4 |
| Bolton Medical Inc | $110.40 | 1 |
| Abiomed | $90.49 | 3 |
| Edwards Lifesciences Corporation | $77.50 | 1 |
What the 2025 payments were for
- Consulting Fee$9,038 · 3 payments
- Travel and Lodging$867.19 · 2 payments
- Food and Beverage$707.79 · 9 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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