Justin T. Mao, MD
NPI 1427052273ActiveIndividual· Internal Medicine, Clinical Cardiac Electrophysiology· Downers Grove, IL
Internal Medicine, Clinical Cardiac Electrophysiology (MD) with Advocate Health and Hospitals Corporation, practicing in Downers Grove, Illinois. Their prescriptions cost Medicare Part D more than their services did: $1,107,251 for 3,569 claims, against $235,106 paid for services in 2024. Abbott Laboratories was the largest of 9 companies reporting payments in 2025, $2,370 in all, mostly travel and lodging. Lists Advocate Good Samaritan Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1427052273 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 9, 2005 |
| Last updated in NPPES | Apr 21, 2025 |
| Certified by provider | Apr 21, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Clinical Cardiac Electrophysiology Primary | 207RC0001X | 036-124995 | IL |
| Internal Medicine | 207R00000X | 219331 | MA |
| Internal Medicine | 207R00000X | 036-124995 | IL |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 036-124995 | IL |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | 225456 | MI |
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 (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,292 |
|---|---|
| Services billed | 3,277 across 75 procedure codes |
| Paid by Medicare | $235,106 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,569 · 8,492 30-day fills |
|---|---|
| Patients | 600 |
| Total drug cost | $1,107,251 |
| Generic share | 74% of claims |
Education and affiliations
| Graduation year | 2001 |
|---|---|
| Medicare specialty | Cardiac Electrophysiology |
| Secondary specialties | Cardiac Surgery |
Medical group
- Advocate Health and Hospitals CorporationChicago, IL · 3,118 clinicians
Hospital affiliations
- Advocate Good Samaritan HospitalDowners Grove, IL
- Edward HospitalNaperville, IL
- Loyola University Medical CenterMaywood, IL
Industry payments (Open Payments)
- 2025$2,370 · 20 payments from 9 companies
- 2024$510.92 · 22 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbott Laboratories | $1,753 | 6 |
| Edwards Lifesciences Corporation | $152.05 | 1 |
| Boston Scientific Corporation | $121.32 | 5 |
| Actelion Pharmaceuticals US, Inc. | $116.78 | 1 |
| Cardiva Medical, Inc. | $84.11 | 2 |
What the 2025 payments were for
- Travel and Lodging$1,675 · 4 payments
- Food and Beverage$694.99 · 16 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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