Margaret Amy Chang, M.D.
NPI 1477504405ActiveIndividual· Ophthalmology, Retina Specialist· Sacramento, CA
Ophthalmology, Retina Specialist (M.D.) in Sacramento, California, trained at University of Missouri, Columbia School of Medicine (class of 2002). In 2024 Medicare paid $4,351,246 for 1,563 patients, and Part D covered 581 of their prescriptions, 64% of them generic. Genentech USA, Inc. was the largest of 14 companies reporting payments in 2025, $82,401 in all, mostly consulting fees.
Overview
| NPI | 1477504405 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 15, 2006 |
| Last updated in NPPES | Apr 2, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology, Retina Specialist Primary | 207WX0107X | A103453 | CA |
| Ophthalmology | 207W00000X | D64111 | MD |
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 (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,563 |
|---|---|
| Services billed | 67,794 across 47 procedure codes |
| Paid by Medicare | $4,351,246 |
Part D prescriptions in 2024
| Prescriptions (claims) | 581 · 845 30-day fills |
|---|---|
| Patients | 207 |
| Total drug cost | $24,597 |
| Generic share | 64% of claims |
Education and affiliations
| Medical school | University of Missouri, Columbia School of Medicine |
|---|---|
| Graduation year | 2002 |
| Medicare specialty | Ophthalmology |
Medical group
- Vitreo-Retinal Medical Group, Inc.Sacramento, CA · 22 clinicians
Hospital affiliation
- Mercy General HospitalSacramento, CA
Industry payments (Open Payments)
- 2025$82,401 · 82 payments from 14 companies
- 2024$68,720 · 72 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genentech USA, Inc. | $23,081 | 17 |
| Roche Products Limited | $17,709 | 5 |
| Boehringer Ingelheim International Gmbh | $17,562 | 11 |
| Genentech, Inc. | $11,162 | 5 |
| Ocular Therapeutix, Inc. | $10,960 | 13 |
What the 2025 payments were for
- Consulting Fee$51,441 · 23 payments
- Travel and Lodging$17,662 · 7 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$8,470 · 4 payments
- Compensation for serving as faculty or as a speaker for a medical education program$2,500 · 1 payment
- Food and Beverage$2,327 · 47 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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