Mani Nallasivan, M.D.
NPI 1639171606ActiveIndividual· Internal Medicine, Cardiovascular Disease· Merced, CA
Internal Medicine, Cardiovascular Disease (M.D.) in Merced, California, licensed in CA, with an NPI issued in August 2005. In 2024 Medicare paid $747,941 for 1,595 patients, and Part D covered 3,214 of their prescriptions, 86% of them generic. Organogenesis Inc. was the largest of 12 companies reporting payments in 2025, $554.60 in all, mostly food and beverage. Lists John C Fremont Healthcare District and 1 other hospital as hospital affiliations.
Overview
| NPI | 1639171606 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Aug 10, 2005 |
| Last updated in NPPES | Mar 14, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | A44096 | CA |
| Internal Medicine, Clinical Cardiac Electrophysiology | 207RC0001X | A44096 | CA |
| Internal Medicine, Interventional Cardiology | 207RI0011X | A44096 | CA |
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 - Cardiovascular Disease (Cardiology) (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,595 |
|---|---|
| Services billed | 9,721 across 101 procedure codes |
| Paid by Medicare | $747,941 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,214 · 8,255 30-day fills |
|---|---|
| Patients | 639 |
| Total drug cost | $467,619 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 1980 |
|---|---|
| Medicare specialty | Cardiovascular Disease (Cardiology) |
| Secondary specialties | Peripheral Vascular Disease |
| Telehealth | Offers telehealth |
Hospital affiliations
- John C Fremont Healthcare DistrictMariposa, CA
- Mercy Medical CenterMerced, CA
Industry payments (Open Payments)
- 2025$554.60 · 31 payments from 12 companies
- 2024$655.36 · 30 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Organogenesis Inc. | $194.34 | 13 |
| Biotronik Inc. | $83.73 | 4 |
| Bayer Healthcare Pharmaceuticals Inc. | $78.94 | 4 |
| Astrazeneca Pharmaceuticals LP | $40.93 | 1 |
| Abiomed | $29.50 | 1 |
What the 2025 payments were for
- Food and Beverage$554.60 · 31 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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