41 CFR § 301-70.501
Does per diem continue when an employee interrupts a travel assignment because of an incapacitating illness or injury?
June 9, 2020
Yes, when an employee interrupts a travel assignment because of an incapacitating illness or injury and takes leave (annual or sick), per diem will be allowed, not to exceed the maximum rate for the location where the interruption occurs, for a reasonable period, normally not to exceed 14 calendar days (including fractional days) for any one period of absence. You may approve a longer period if justified.
[FTR Amdt. 108, 67 FR 57967, Sept. 13, 2002]