If you are enrolled in Medicare and you have a low income, you can apply to the Medicare Part D Extra Help program. Extra Help is the name of a Medicare program that can help you pay for all or part of your premiums, all or part of your annual deductible, and lower the co-pays on your prescriptions. It is also called the Medicare Low Income Subsidy (LIS).
Starting January 1, 2024, anyone who qualifies for Extra Help gets a full subsidy. Partial subsidies are gone now. A full subsidy pays for most of your costs.