Felice R. Zwas, M.D.
NPI 1225059116ActiveIndividual· Internal Medicine, Gastroenterology· Greenwich, CT
Internal Medicine, Gastroenterology (M.D.) in Greenwich, Connecticut, trained at Columbia University College of Physicians and Surgeons (class of 1980). Their prescriptions cost Medicare Part D more than their services did: $1,038,806 for 959 claims, against $330,132 paid for services in 2024. Pfizer Inc. was the largest of 4 companies reporting payments in 2025, $404.46 in all, mostly food and beverage.
Overview
| NPI | 1225059116 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jul 23, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 028878 | CT |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 522 |
|---|---|
| Services billed | 16,574 across 34 procedure codes |
| Paid by Medicare | $330,132 |
Part D prescriptions in 2024
| Prescriptions (claims) | 959 · 1,844 30-day fills |
|---|---|
| Patients | 259 |
| Total drug cost | $1,038,806 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Columbia University College of Physicians and Surgeons |
|---|---|
| Graduation year | 1980 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Connecticut Gi PLLCWallingford, CT · 248 clinicians
Hospital affiliation
- Greenwich Hospital Association -Greenwich, CT
Industry payments (Open Payments)
- 2025$404.46 · 24 payments from 4 companies
- 2024$624.50 · 34 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $268.96 | 18 |
| Abbvie Inc. | $96.33 | 4 |
| Ardelyx, Inc. | $25.41 | 1 |
| Lilly USA, LLC | $13.76 | 1 |
What the 2025 payments were for
- Food and Beverage$404.46 · 24 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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