20 C.F.R. § 404.1598 If you become disabled by another impairment(s).
Title 20 - Employees' Benefits
If a new severe impairment(s) begins in or before the month in which your last impairment(s) ends, we will find that your disability is continuing. The new impairment(s) need not be expected to last 12 months or to result in death, but it must be severe enough to keep you from doing substantial gainful activity, or severe enough so that you are still disabled under §404.1594. [50 FR 50136, Dec. 6, 1985]
Title 20: Employees' Benefits
PART 404—FEDERAL OLD-AGE, SURVIVORS AND DISABILITY INSURANCE (1950– )
Subpart P—Determining Disability and Blindness
Continuing or Stopping Disability
§ 404.1598 If you become disabled by another impairment(s).