Karthik Gunachelvan
NPI 1740604941ActiveIndividual· Internal Medicine· Darien, CT
Internal Medicine with Stamford Health Medical Group Inc and 1 other group, practicing in Darien, Connecticut. Their prescriptions cost Medicare Part D more than their services did: $794,840 for 8,148 claims, against $130,327 paid for services in 2024. Lists Baystate Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1740604941 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Sole proprietor | Yes |
| NPI issued | Feb 7, 2014 |
| Last updated in NPPES | Oct 21, 2025 |
| Certified by provider | Oct 21, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 82825 | CT |
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 (CT); Practitioner - Internal Medicine (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 461 |
|---|---|
| Services billed | 1,754 across 29 procedure codes |
| Paid by Medicare | $130,327 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,148 · 17,213 30-day fills |
|---|---|
| Patients | 914 |
| Total drug cost | $794,840 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 2013 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Stamford Health Medical Group IncStamford, CT · 444 clinicians
- Riverbend Medical Group IncAgawam, MA · 226 clinicians
Hospital affiliations
- Baystate Medical CenterSpringfield, MA
- Mercy Medical CtrSpringfield, MA
- Stamford HospitalStamford, CT
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 19 internal medicine physicians in Darien · All internal medicine physicians in Connecticut