Issam A. Oneyssi, M.D.
NPI 1528026622ActiveIndividual· Internal Medicine· Southbridge, MA
Internal Medicine (M.D.) with Umass Memorial Medical Group Inc, practicing in Southbridge, Massachusetts. In 2024 Medicare paid $49,157 for 176 patients, and Part D covered 268 of their prescriptions, 89% of them generic. Medtronic, Inc. was the largest of 2 companies reporting payments in 2025, $75.89 in all, mostly food and beverage. Lists Umass Memorial Health - Harrington Hospital as a hospital affiliation.
Overview
| NPI | 1528026622 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 1, 2006 |
| Last updated in NPPES | Oct 2, 2025 |
| Certified by provider | Oct 2, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 76569 | MA |
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 | 176 |
|---|---|
| Services billed | 524 across 11 procedure codes |
| Paid by Medicare | $49,157 |
Part D prescriptions in 2024
| Prescriptions (claims) | 268 · 354 30-day fills |
|---|---|
| Patients | 117 |
| Total drug cost | $18,452 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 1990 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Umass Memorial Medical Group IncWorcester, MA · 2,516 clinicians
Hospital affiliation
- Umass Memorial Health - Harrington HospitalSouthbridge, MA
Other facilities
- Brookhaven HospiceHospice · Marlborough, MA
Industry payments (Open Payments)
- 2025$75.89 · 2 payments from 2 companies
- 2024$287.74 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medtronic, Inc. | $61.13 | 1 |
| Pfizer Inc. | $14.76 | 1 |
What the 2025 payments were for
- Food and Beverage$75.89 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 18 internal medicine physicians in Southbridge · All internal medicine physicians in Massachusetts