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Yes. If you suffer a disability after filing early for retirement benefits, you may be able to change to Social Security Disability Insurance (SSDI). Similarly, if you retire early but belatedly discover that an existing condition might have qualified you for a disability benefit that would have been larger, you may be able to claim it retroactively.
Most disability recipients claim SSDI before retiring, so the question is usually moot. If you file first for SSDI, at any age, the benefit is calculated as if you were at full retirement age (FRA) — the age at which you qualify for 100 percent of the benefit amount determined by your lifetime earnings. Once you reach FRA, your disability benefit automatically converts to a retirement benefit, in most cases at the same amount.
But suppose you started Social Security at 62, for reasons unrelated to health, taking a reduction in benefits for filing before full retirement age (which is 66 and 10 months for people born in 1959 and 67 for people born in 1960 or later). Six months later, you are diagnosed with kidney disease.
You can file for SSDI, and if the claim is approved, you will receive a higher benefit, backdated to when you applied for disability. (You will still not get your full retirement benefit, but the “reduction factor” for early retirement will shrink from four-plus years to just the period when you were only eligible for retirement benefits.)
More on Social Security
What automatically qualifies you for disability benefits?
How long before my Social Security disability benefits start?