Frederick Rozenshteyn, MD
NPI 1609309558ActiveIndividual· Internal Medicine, Gastroenterology· Stamford, CT
Internal Medicine, Gastroenterology (MD) in Stamford, Connecticut, trained at Tufts University School of Medicine (class of 2017). Their prescriptions cost Medicare Part D more than their services did: $92,423 for 138 claims, against $10,875 paid for services in 2024. Janssen Biotech, Inc. was the largest of 3 companies reporting payments in 2025, $262.83 in all, mostly food and beverage.
Overview
| NPI | 1609309558 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 7, 2017 |
| Last updated in NPPES | Sep 19, 2024 |
| Certified by provider | Sep 19, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 76935 | 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 - Gastroenterology (CT) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 70 |
|---|---|
| Services billed | 106 across 14 procedure codes |
| Paid by Medicare | $10,875 |
Part D prescriptions in 2024
| Prescriptions (claims) | 138 · 187 30-day fills |
|---|---|
| Patients | 60 |
| Total drug cost | $92,423 |
| Generic share | 72% of claims |
Education and affiliations
| Medical school | Tufts University School of Medicine |
|---|---|
| Graduation year | 2017 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Stamford Health Medical Group IncStamford, CT · 444 clinicians
Hospital affiliation
- Stamford HospitalStamford, CT
Industry payments (Open Payments)
- 2025$262.83 · 6 payments from 3 companies
- 2024$156.69 · 3 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $128.06 | 1 |
| Abbvie Inc. | $100.85 | 4 |
| Madrigal Pharmaceuticals | $33.92 | 1 |
What the 2025 payments were for
- Food and Beverage$262.83 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 15 gastroenterologists in Stamford · All gastroenterologists in Connecticut