Konstantin Vaizman, M.D.
NPI 1639268105ActiveIndividual· Internal Medicine, Gastroenterology· Brooklyn, NY
Internal Medicine, Gastroenterology (M.D.) with Amboy Medical Practice PC and 2 other groups, practicing in Brooklyn, New York. Their prescriptions cost Medicare Part D more than their services did: $288,961 for 1,893 claims, against $65,539 paid for services in 2024. Madrigal Pharmaceuticals was the largest of 7 companies reporting payments in 2025, $568.35 in all, mostly food and beverage. Lists Richmond University Medical Center as a hospital affiliation.
Overview
| NPI | 1639268105 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Oct 12, 2006 |
| Last updated in NPPES | Jul 22, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 242086 | 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 | 324 |
|---|---|
| Services billed | 642 across 18 procedure codes |
| Paid by Medicare | $65,539 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,893 · 2,098 30-day fills |
|---|---|
| Patients | 396 |
| Total drug cost | $288,961 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 2003 |
|---|---|
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Amboy Medical Practice PCStaten Island, NY · 173 clinicians
- Jal 28 LLCBrooklyn, NY · 13 clinicians
- Nyc Medical Doctor P.C.Brooklyn, NY · 9 clinicians
Hospital affiliation
- Richmond University Medical CenterStaten Island, NY
Industry payments (Open Payments)
- 2025$568.35 · 28 payments from 7 companies
- 2024$289.51 · 14 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $225.51 | 13 |
| Janssen Biotech, Inc. | $84.99 | 1 |
| Abbvie Inc. | $83.02 | 4 |
| Gilead Sciences, Inc. | $77.71 | 4 |
| Ardelyx, Inc. | $68.92 | 4 |
What the 2025 payments were for
- Food and Beverage$483.36 · 27 payments
- Education$84.99 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 233 gastroenterologists in Brooklyn · All gastroenterologists in New York