Direct answer
Does SSDI convert to retirement at full retirement age?
Yes — when an SSDI recipient reaches full retirement age, SSDI automatically converts to Social Security retirement benefits at the same monthly amount, and Medicare coverage continues without interruption.
The conversion is automatic and requires no action from the recipient. Because the SSDI benefit is already calculated on the worker's Primary Insurance Amount, the retirement benefit is not reduced.
Sourced from ssa.gov — see citations below.
What happens at full retirement age?
SSDI converts to retirement benefits automatically; the check amount stays the same.
Does Medicare continue?
Yes — Medicare coverage continues.
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Sources
Every figure and rule on this page is drawn from official SSA publications. Verify at the links below.