Barry Z. Izenstein, M.D.
NPI 1346237583ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Springfield, MA
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) in Springfield, Massachusetts, licensed in MA, with an NPI issued in October 2005. Their prescriptions cost Medicare Part D more than their services did: $1,231,911 for 6,468 claims, against $41,870 paid for services in 2024. Pfizer Inc. reported $40.27 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1346237583 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 3, 2005 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 39301 | MA |
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 - Endocrinology (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 384 |
|---|---|
| Services billed | 1,104 across 17 procedure codes |
| Paid by Medicare | $41,870 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,468 · 15,179 30-day fills |
|---|---|
| Patients | 604 |
| Total drug cost | $1,231,911 |
| Generic share | 74% of claims |
Industry payments (Open Payments)
- 2025$40.27 · 2 payments from 1 company
- 2024$681.11 · 32 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $40.27 | 2 |
What the 2025 payments were for
- Food and Beverage$40.27 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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