Physician
Louis K Chang, M.D., PH.D.
According to 2025 Medicare claims, Louis Chang, M.D., PH.D. (NPI: 1538295720) practices ophthalmology in the San Francisco-San Mateo-Redwood City, CA market, with the plurality of this provider's patient population coming from San Mateo, CA. This provider's primary affiliated billing organization is NORTHERN CALIFORNIA RETINA VITREOUS ASSOCIATES MEDICAL GROUP, INC. (NPI: 1538275920; TIN: 942906234) and primary practice location at 94401-3859.
Chang's data goes back to 2015 and runs through 2024. For example, in 2024, this provider had 660 traditional Medicare patients, billed 23,664 HCPCS/CPT codes, and received $2,333,151 in Medicare payments. The top billing code was 67028 (Injection of drug into eye). Part D data shows 217 prescription claims across 64 beneficiaries totaling $8,660 in drug costs, led by Prednisolone Acetate (Prednisolone Acetate). Open Payments data shows 3 records totaling $89. You can download detailed data with all billing codes (2015-2024). For more recent data, please contact us.
Over the past 10 years, this provider's Medicare Part B carrier billing has moved from a lower plateau to a higher plateau, from $1,023,790 to $2,333,151. Concurrently, Part D prescription costs did not follow a clear longitudinal pattern. For DME billing, this provider has fewer than 5 years of reported data, so a reliable trend cannot be assigned.