Eligibility for Medicare before the typical age requirement of 65 primarily hinges on receiving Social Security Disability Insurance (SSDI) benefits for at least 24 months. SSDI is available to those with a long-term disabling condition expected to last at least one year or result in death.
The Social Security Administration (SSA) evaluates eligibility through a five-step process that assesses work status, severity of impairments and the ability to perform past or other work. To qualify, individuals must also have sufficient work history under SSDI, typically requiring 40 work credits, half of which must have been earned in the last ten years.