John Joseph Hennessey, M.D.
NPI 1215916564ActiveIndividual· Internal Medicine· Gales Ferry, CT
Internal Medicine (M.D.) in Gales Ferry, Connecticut, trained at Tufts University School of Medicine (class of 1996). Their prescriptions cost Medicare Part D more than their services did: $1,725,101 for 16,154 claims, against $400,487 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 24 companies reporting payments in 2025, $1,398 in all, mostly food and beverage.
Overview
| NPI | 1215916564 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 14, 2006 |
| Last updated in NPPES | Nov 30, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 037592 | 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) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 738 |
|---|---|
| Services billed | 9,020 across 46 procedure codes |
| Paid by Medicare | $400,487 |
Part D prescriptions in 2024
| Prescriptions (claims) | 16,154 · 30,126 30-day fills |
|---|---|
| Patients | 1,053 |
| Total drug cost | $1,725,101 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Tufts University School of Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Internal Medicine |
Medical groups
- Ptsma IncAnsonia, CT · 224 clinicians
- Gales Ferry Medical Group LLCGales Ferry, CT · 4 clinicians
Hospital affiliations
- Lawrence & Memorial HospitalNew London, CT
- Westerly HospitalWesterly, RI
- Yale-New Haven HospitalNew Haven, CT
Other facilities
- Centerwell Home HealthHome health agency · Rocky Hill, CT
- Hartford Healthcare at HomeHome health agency · East Hartford, CT
- Masonicare Home Health & Hospice, IncHome health agency · Wallingford, CT
- Yale New Haven Health - Health at Home SoutheastHome health agency · Waterford, CT
- Hartford Healthcare at HomeHospice · East Hartford, CT
- Masonicare Home Health and Hospice IncHospice · Wallingford, CT
- Avalon Health Care Center at StoneridgeNursing home · Mystic, CT
- Complete Care at Groton RegencyNursing home · Groton, CT
Industry payments (Open Payments)
- 2025$1,398 · 57 payments from 24 companies
- 2024$1,517 · 59 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $266.16 | 8 |
| Novo Nordisk Inc | $140.06 | 7 |
| Amgen Inc. | $135.59 | 7 |
| Lilly USA, LLC | $89.41 | 3 |
| Astellas Pharma US Inc | $82.82 | 3 |
What the 2025 payments were for
- Food and Beverage$1,398 · 57 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine providers in Gales Ferry
- 1194859058
- 1669451894