Starting January 1, 2024, once your out-of-pocket spending reaches $8,000 (including certain payments made by other people or entities, including Medicare’s Extra Help program, on your behalf), you’ll automatically get “catastrophic coverage.” This means you won’t have to pay a copayment or coinsurance for covered Part D drugs for the rest of the calendar year.
https://www.medicare.gov/drug-coverage-part-d/costs-for-medicare-drug-coverage/catastrophic-coverage
https://www.medicare.gov/drug-coverage-part-d/costs-for-medicare-drug-coverage/catastrophic-coverage