Constantine Yiachos, M.D.
NPI 1063588127ActiveIndividual· Internal Medicine, Gastroenterology· Staten Island, NY
Internal Medicine, Gastroenterology (M.D.) in Staten Island, New York, trained at State University of New York Downstate Medical Center (class of 1985). Their prescriptions cost Medicare Part D more than their services did: $302,953 for 1,792 claims, against $98,455 paid for services in 2024. Gilead Sciences, Inc. reported $23.26 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1063588127 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 28, 2006 |
| Last updated in NPPES | Nov 16, 2023 |
| Certified by provider | Nov 16, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 172409 | NY |
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 - Gastroenterology (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 572 |
|---|---|
| Services billed | 785 across 16 procedure codes |
| Paid by Medicare | $98,455 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,792 · 4,379 30-day fills |
|---|---|
| Patients | 530 |
| Total drug cost | $302,953 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | State University of New York Downstate Medical Center |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Gastroenterology |
Medical group
- Icahn School of Medicine at Mount SinaiStaten Island, NY · 33 clinicians
Hospital affiliations
- Richmond University Medical CenterStaten Island, NY
- Staten Island University HospitalStaten Island, NY
Industry payments (Open Payments)
- 2025$23.26 · 1 payment from 1 company
- 2024$309.01 · 11 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $23.26 | 1 |
What the 2025 payments were for
- Food and Beverage$23.26 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 49 gastroenterologists in Staten Island · All gastroenterologists in New York