The Social Security Administration will evaluate a claimant's medical criteria to determine if they qualify for both Supplemental Security Income (SSI) and Social Security Disability Insurance (SSDI). Disability claimants must have a medically determinable impairment which is severe enough to prohibit a claimant from performing substantial gainful activity. Claimants must be unable to not only to work their current job but lack the ability to be retrained for any other work found in sufficient numbers in the national economy. Severe mental or physical health conditions must be expected to last for at least 12 months or result in the claimant's death. The impairments must also be established by medical evidence including MRIs, CAT scans, X-rays, physician's notes or lab tests.