41 CFR 301-30.3: -30.3 Allowable expenses for incapacitating illness or injury during TDY.

The agency may pay:

(a) Per diem expenses while the employee is on leave (annual or sick), not to exceed the per diem rate at the location where the employee incurred or was treated for the incapacitating illness or injury, for a reasonable period that generally may not to exceed 14 calendar days (including fractional days) for any one period of absence. Agencies may approve a longer period of time if justified.

(b) The following additional expenses when the employee discontinues a TDY assignment before its completion due to an incapacitating illness or injury:

(1) Transportation and per diem expenses for travel to an alternate location for medical treatment.

(2) Transportation and per diem expenses to return to the official station.

(3) Transportation costs for a medically necessary attendant.