(a) Unrelated severe impairments. We cannot combine two or more unrelated severe impairments to meet the 12-month duration test. If you have a severe impairment(s) and then develop another unrelated severe impairment(s) but neither one is expected to last for 12 months, we cannot find you disabled, even though the two impairments in combination last for 12 months.
(b) Concurrent impairments. If you have two or more concurrent impairments which, when considered in combination, are severe, we must also determine whether the combined effect of your impairments can be expected to continue to be severe for 12 months. If one or more of your impairments improves or is expected to improve within 12 months, so that the combined effect of your remaining impairments is no longer severe, we will find that you do not meet the 12-month duration test.
[50 FR 8728, Mar. 5, 1985]