Seshan Subramanian, MD
NPI 1083691950ActiveIndividual· Internal Medicine, Hematology & Oncology· Chicago, IL
Internal Medicine, Hematology & Oncology (MD) with Mount Sinai Community Foundation, practicing in Chicago, Illinois. Their prescriptions cost Medicare Part D more than their services did: $150,351 for 167 claims, against $15,865 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 25 companies reporting payments in 2025, $1,947 in all, mostly food and beverage. Lists Holy Cross Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1083691950 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Dec 30, 2005 |
| Last updated in NPPES | Aug 19, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 036041610 | IL |
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 - Hematology/Oncology (IL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 99 |
|---|---|
| Services billed | 274 across 10 procedure codes |
| Paid by Medicare | $15,865 |
Part D prescriptions in 2024
| Prescriptions (claims) | 167 · 271 30-day fills |
|---|---|
| Patients | 54 |
| Total drug cost | $150,351 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 1961 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine, Medical Oncology |
| Telehealth | Offers telehealth |
Medical group
- Mount Sinai Community FoundationChicago, IL · 248 clinicians
Hospital affiliations
- Holy Cross HospitalChicago, IL
- Mt Sinai Hospital Medical CenterChicago, IL
- Osf Little Company of Mary Medical CenterEvergreen Park, IL
Industry payments (Open Payments)
- 2025$1,947 · 85 payments from 25 companies
- 2024$1,575 · 73 payments from 23 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $428.57 | 20 |
| Novartis Pharmaceuticals Corporation | $160.78 | 6 |
| Takeda Pharmaceuticals U.S.A., Inc. | $156.41 | 7 |
| Array Biopharma Inc | $140.49 | 6 |
| Pfizer Inc. | $126.42 | 5 |
What the 2025 payments were for
- Food and Beverage$1,947 · 85 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other hematologist-oncologists in Chicago
- 1003234329
- 1023238862
- 1023278892
- 1033451513
- 1033548383
- 1033562327
- 1043258254
- 1043409394
- 1043531981
- 1053585463
- 1053802975
- 1073003877
All 251 hematologist-oncologists in Chicago · All hematologist-oncologists in Illinois