Dionisio James Mariano, MD
NPI 1649220229ActiveIndividual· Internal Medicine, Clinical Cardiac Electrophysiology· Appleton, WI
Internal Medicine, Clinical Cardiac Electrophysiology (MD) in Appleton, Wisconsin, trained at Mayo Medical School (class of 1985). Their prescriptions cost Medicare Part D more than their services did: $572,508 for 1,774 claims, against $86,242 paid for services in 2024. Medtronic, Inc. was the largest of 6 companies reporting payments in 2025, $3,066 in all, mostly travel and lodging.
Overview
| NPI | 1649220229 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 12, 2006 |
| Last updated in NPPES | Mar 16, 2020 |
| Certified by provider | Mar 16, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Clinical Cardiac Electrophysiology Primary | 207RC0001X | 33293-020 | WI |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 33293-020 | WI |
| Internal Medicine | 207R00000X | 33293-020 | WI |
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 - Cardiac Electrophysiology (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 380 |
|---|---|
| Services billed | 1,736 across 64 procedure codes |
| Paid by Medicare | $86,242 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,774 · 4,349 30-day fills |
|---|---|
| Patients | 372 |
| Total drug cost | $572,508 |
| Generic share | 73% of claims |
Education and affiliations
| Medical school | Mayo Medical School |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Cardiac Electrophysiology |
| Secondary specialties | Cardiovascular Disease (Cardiology) |
Medical group
- Ascension Medical Group-Fox Valley Wisconsin, IncAppleton, WI · 259 clinicians
Hospital affiliations
- Ascension Ne Wisconsin - St Elizabeth CampusAppleton, WI
- Thedacare Regional Med Ctr - NeenahNeenah, WI
- Thedacare Regional Medical Center - Appleton IncAppleton, WI
Industry payments (Open Payments)
- 2025$3,066 · 23 payments from 6 companies
- 2024$14.90 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medtronic, Inc. | $2,897 | 18 |
| Cleerly, Inc. | $75.39 | 1 |
| Boston Scientific Corporation | $29.46 | 1 |
| Alnylam Pharmaceuticals Inc. | $28.34 | 1 |
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $18.68 | 1 |
What the 2025 payments were for
- Travel and Lodging$1,539 · 8 payments
- Food and Beverage$1,526 · 15 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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