Iryna G. Chastain, M.D.
NPI 1285801407ActiveIndividual· Internal Medicine· Worcester, MA
Internal Medicine (M.D.) with Reliant Medical Group Inc, practicing in Worcester, Massachusetts. 142 Medicare patients in 2024, $49,323 paid; nearly all of their 231 Part D prescriptions were generic (91%). Lists St Vincent Hospital as a hospital affiliation.
Overview
| NPI | 1285801407 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 15, 2008 |
| Last updated in NPPES | Mar 9, 2020 |
| Certified by provider | Mar 9, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 238742 | MA |
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 - Internal Medicine (MA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 142 |
|---|---|
| Services billed | 533 across 4 procedure codes |
| Paid by Medicare | $49,323 |
Part D prescriptions in 2024
| Prescriptions (claims) | 231 · 272 30-day fills |
|---|---|
| Patients | 96 |
| Total drug cost | $11,792 |
| Generic share | 91% of claims |
Education and affiliations
| Graduation year | 1997 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Reliant Medical Group IncWorcesteer, MA · 640 clinicians
Hospital affiliation
- St Vincent HospitalWorcester, MA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 471 internal medicine physicians in Worcester · All internal medicine physicians in Massachusetts