William Preskenis, MD
NPI 1104803808ActiveIndividual· Internal Medicine, Pulmonary Disease· Glastonbury, CT
Internal Medicine, Pulmonary Disease (MD) in Glastonbury, Connecticut, trained at Saint Louis University School of Medicine (class of 1983). Their prescriptions cost Medicare Part D more than their services did: $1,213,497 for 2,317 claims, against $109,796 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 23 companies reporting payments in 2025, $2,569 in all, mostly food and beverage.
Overview
| NPI | 1104803808 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Dec 23, 2005 |
| Last updated in NPPES | Mar 7, 2023 |
| Certified by provider | Jun 21, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | 026608 | 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 - Pulmonary Disease (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 412 |
|---|---|
| Services billed | 1,493 across 16 procedure codes |
| Paid by Medicare | $109,796 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,317 · 3,932 30-day fills |
|---|---|
| Patients | 397 |
| Total drug cost | $1,213,497 |
Education and affiliations
| Medical school | Saint Louis University School of Medicine |
|---|---|
| Graduation year | 1983 |
| Medicare specialty | Pulmonary Disease |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Prime Healthcare, PCAvon, CT · 67 clinicians
Industry payments (Open Payments)
- 2025$2,569 · 105 payments from 23 companies
- 2024$3,150 · 126 payments from 21 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $1,010 | 41 |
| Jazz Pharmaceuticals Inc. | $184.78 | 5 |
| Actelion Pharmaceuticals US, Inc. | $167.93 | 5 |
| Astrazeneca Pharmaceuticals LP | $161.03 | 9 |
| Harmony Biosciences LLC | $157.71 | 7 |
What the 2025 payments were for
- Food and Beverage$2,569 · 105 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Pulmonary Disease providers in Glastonbury
- 1982681599
- 1588641112
- 1538490594
All Internal Medicine, Pulmonary Disease providers in Connecticut →