The Low Income Subsidy (LIS), also known as “Extra Help”, is a Medicare program to help people with limited income and resources pay Medicare drug coverage (Part D) premiums, deductibles, coinsurance, and other costs. In most cases, to qualify for Extra Help, you must have income and resources below a certain limit. These limits may go up each year.

References

https://www.cms.gov/training-education/partner-outreach-resources/low-income-subsidy-lis
https://www.medicare.gov/basics/costs/help/drug-costs