Kartik K. Viswanathan, MD
NPI 1629150974ActiveIndividual· Internal Medicine· Norwich, CT
Internal Medicine (MD) with Western Mass Physician Associates Inc, practicing in Norwich, Connecticut. Their prescriptions cost Medicare Part D more than their services did: $417,301 for 4,979 claims, against $29,939 paid for services in 2024. Lilly USA, LLC reported $47.51 in payments in 2025, mostly food and beverage. Lists Baystate Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1629150974 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 19, 2006 |
| Last updated in NPPES | Dec 21, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 035789 | 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 (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 283 |
|---|---|
| Services billed | 803 across 26 procedure codes |
| Paid by Medicare | $29,939 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,979 · 9,515 30-day fills |
|---|---|
| Patients | 562 |
| Total drug cost | $417,301 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 1991 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Western Mass Physician Associates IncHolyoke, MA · 71 clinicians
Hospital affiliations
- Baystate Medical CenterSpringfield, MA
- Cooley Dickinson Hospital Inc,theNorthampton, MA
- Holyoke Medical CenterHolyoke, MA
Other facilities
- Amedisys Home Health CareHome health agency · Agawam, MA
- Baystate Home HealthHome health agency · W Springfield, MA
- CaretendersHome health agency · Holyoke, MA
- Elara CaringHome health agency · Braintree, MA
- Holyoke Visiting Nurse AssocHome health agency · Holyoke, MA
Industry payments (Open Payments)
- 2025$47.51 · 2 payments from 1 company
- 2024$19.56 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $47.51 | 2 |
What the 2025 payments were for
- Food and Beverage$47.51 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other internal medicine physicians in Norwich
- 1063695294
- 1073977062
- 1215115472
- 1225140650
- 1457319998
- 1538271960
- 1598714701
- 1609982560
- 1629068598
- 1710962428
- 1811990013
- 1841490299
All 38 internal medicine physicians in Norwich · All internal medicine physicians in Connecticut