Subramanian Gnanaguruparan, MD
NPI 1396058533ActiveIndividual· Internal Medicine, Cardiovascular Disease· Newark, DE
Internal Medicine, Cardiovascular Disease (MD) with Christiana Care Health Services Inc and 2 other groups, practicing in Newark, Delaware. Their prescriptions cost Medicare Part D more than their services did: $192,884 for 1,111 claims, against $117,254 paid for services in 2024. Novo Nordisk Inc was the largest of 5 companies reporting payments in 2025, $407.38 in all, mostly food and beverage. Lists Christiana Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1396058533 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jul 16, 2010 |
| Last updated in NPPES | Oct 6, 2021 |
| Certified by provider | Oct 6, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | C1-0010444 | DE |
| Internal Medicine | 207R00000X | 284558 | NY |
| Internal Medicine | 207R00000X | C1-0010444 | DE |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | NJ |
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 (DE); Practitioner - Internal Medicine (MD); Practitioner - Internal Medicine (NJ); Practitioner - Hospitalist (NY); Practitioner - Cardiovascular Disease (Cardiology) (PA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 522 |
|---|---|
| Services billed | 1,875 across 46 procedure codes |
| Paid by Medicare | $117,254 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,111 · 2,750 30-day fills |
|---|---|
| Patients | 252 |
| Total drug cost | $192,884 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 1995 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Cardiovascular Disease (Cardiology) |
Medical groups
- Christiana Care Health Services IncNewark, DE · 1,483 clinicians
- Christiana Care Pennsylvania IncGlen Mills, PA · 177 clinicians
- Christiana Care Health InitiativesWilmington, DE · 32 clinicians
Hospital affiliations
- Christiana HospitalNewark, DE
- Inspira Medical Center Mullica HillElmer, NJ
Industry payments (Open Payments)
- 2025$407.38 · 8 payments from 5 companies
- 2024$629.26 · 13 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $136.69 | 2 |
| Pfizer Inc. | $134.30 | 2 |
| Amgen Inc. | $108.87 | 2 |
| Novartis Pharmaceuticals Corporation | $15.22 | 1 |
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $12.30 | 1 |
What the 2025 payments were for
- Food and Beverage$407.38 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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