Disabled

For purposes of enrollment under Medicare, individuals younger than 65 years of age who have been entitled to disability benefits under the Social Security Act or the railroad retirement system for at least 24 months are considered disabled and are entitled to Medicare.

Disabled enrollee

Individual younger than age 65 who has been entitled to disability benefits under Title II of the Social Security Act or the Railroad Retirement system for at least 2 years and who is enrolled in the supplemental medical insurance (SMI) program.