Warren Jeffrey Chang, M.D.
NPI 1902888662ActiveIndividual· Ophthalmology· Bloomington, IN
Ophthalmology (M.D.) in Bloomington, Indiana, trained at Harvard Medical School (class of 1992). In 2024 Medicare paid $1,832,101 for 1,217 patients, and Part D covered 1,364 of their prescriptions, 73% of them generic. Alcon Vision LLC was the largest of 9 companies reporting payments in 2025, $445.86 in all, mostly food and beverage.
Overview
| NPI | 1902888662 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 17, 2005 |
| Last updated in NPPES | Feb 14, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | IN01052241 | IN |
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 - Ophthalmology (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,217 |
|---|---|
| Services billed | 15,693 across 64 procedure codes |
| Paid by Medicare | $1,832,101 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,364 · 2,246 30-day fills |
|---|---|
| Patients | 445 |
| Total drug cost | $171,643 |
| Generic share | 73% of claims |
Education and affiliations
| Medical school | Harvard Medical School |
|---|---|
| Graduation year | 1992 |
| Medicare specialty | Ophthalmology |
Medical group
- Integ Health System PCBloomington, IN · 8 clinicians
Hospital affiliation
- Monroe HospitalBloomington, IN
Industry payments (Open Payments)
- 2025$445.86 · 18 payments from 9 companies
- 2024$777.48 · 27 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alcon Vision LLC | $165.14 | 7 |
| Genentech USA, Inc. | $79.68 | 3 |
| Glaukos Corporation | $59.97 | 2 |
| Mallinckrodt Hospital Products Inc. | $30.36 | 1 |
| Harrow Eye, LLC | $26.37 | 1 |
What the 2025 payments were for
- Food and Beverage$445.86 · 18 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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