Robert T. Chang, MD
NPI 1417044280ActiveIndividual· Ophthalmology, Glaucoma Specialist· Stanford, CA
Ophthalmology, Glaucoma Specialist (MD) in Stanford, California, trained at University of Missouri, Columbia School of Medicine (class of 2002). In 2024 Medicare paid $273,146 for 752 patients, and Part D covered 1,784 of their prescriptions, 45% of them generic. Alcon Vision LLC was the largest of 7 companies reporting payments in 2025, $20,483 in all, mostly consulting fees.
Overview
| NPI | 1417044280 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 5, 2006 |
| Last updated in NPPES | Mar 18, 2024 |
| Certified by provider | Mar 18, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology, Glaucoma Specialist Primary | 207WX0009X | A108857 | CA |
| Ophthalmology | 207W00000X | 2004011762 | MO |
| Ophthalmology | 207W00000X | ME99224 | FL |
| Ophthalmology | 207W00000X | A108857 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 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 | 752 |
|---|---|
| Services billed | 3,165 across 50 procedure codes |
| Paid by Medicare | $273,146 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,784 · 3,056 30-day fills |
|---|---|
| Patients | 445 |
| Total drug cost | $300,983 |
| Generic share | 45% of claims |
Education and affiliations
| Medical school | University of Missouri, Columbia School of Medicine |
|---|---|
| Graduation year | 2002 |
| Medicare specialty | Ophthalmology |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$20,483 · 49 payments from 7 companies
- 2024$38,390 · 76 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alcon Vision LLC | $13,046 | 28 |
| Alcon Research LLC | $4,000 | 4 |
| Sight Sciences, Inc. | $1,469 | 6 |
| Glaukos Corporation | $1,091 | 5 |
| Abbvie Inc. | $788.44 | 3 |
What the 2025 payments were for
- Consulting Fee$17,025 · 10 payments
- Food and Beverage$2,333 · 38 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$1,125 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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