Leon Pappas, MD, PHD
NPI 1164910519ActiveIndividual· Internal Medicine, Medical Oncology· Boston, MA
Internal Medicine, Medical Oncology (MD, PHD) in Boston, Massachusetts, trained at Boston University School of Medicine (class of 2018). Their prescriptions cost Medicare Part D more than their services did: $45,778 for 109 claims, against $18,732 paid for services in 2024. E.R. Squibb & Sons, L.L.C. was the largest of 6 companies reporting payments in 2025, $5,471 in all, mostly consulting fees.
Overview
| NPI | 1164910519 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD, PHD |
| Sole proprietor | No |
| NPI issued | May 1, 2018 |
| Last updated in NPPES | Feb 10, 2026 |
| Certified by provider | Feb 10, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | 1016384 | MA |
| Internal Medicine | 207R00000X | 1016384 | MA |
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 - Internal Medicine (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 50 |
|---|---|
| Services billed | 304 across 8 procedure codes |
| Paid by Medicare | $18,732 |
Part D prescriptions in 2024
| Prescriptions (claims) | 109 · 120 30-day fills |
|---|---|
| Patients | 45 |
| Total drug cost | $45,778 |
| Generic share | 71% of claims |
Education and affiliations
| Medical school | Boston University School of Medicine |
|---|---|
| Graduation year | 2018 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Massachusetts General Physicians Organization IncBoston, MA · 3,558 clinicians
- Brigham and Womens Physicians Organization IncBoston, MA · 2,994 clinicians
- The General Hospital CorporationBoston, MA · 1,267 clinicians
Hospital affiliations
- Brigham and Women's HospitalBoston, MA
- Massachusetts Eye and Ear Infirmary -Boston, MA
- Massachusetts General HospitalBoston, MA
- Wentworth-Douglass HospitalDover, NH
Other facilities
- Mass General Brigham Home Care, IncHome health agency · Newton, MA
- Care Dimensions, IncHospice · Danvers, MA
Industry payments (Open Payments)
- 2025$5,471 · 9 payments from 6 companies
- 2024$181.59 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| E.R. Squibb & Sons, L.L.C. | $3,968 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $1,053 | 2 |
| Astrazeneca Uk Limited | $134.99 | 1 |
| Beone Medicines USA, Inc. | $134.78 | 1 |
| Astrazeneca Pharmaceuticals LP | $113.19 | 2 |
What the 2025 payments were for
- Consulting Fee$4,720 · 2 payments
- Food and Beverage$450.96 · 5 payments
- Travel and Lodging$300.30 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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