41 C.F.R. § 301-70.505
Yes. When an employee interrupts a TDY assignment because of an incapacitating illness or injury and takes leave of absence for travel to an alternate location to obtain medical services and returns to the TDY assignment, you may reimburse certain excess travel costs provided in this section. Specifically, you may reimburse the excess (if any) of actual costs of travel from the point of interruption to the alternate location and return to the TDY assignment, over the constructive costs of round-trip travel between the official station and the alternate location. The nearest hospital or medical facility capable of treating the employee's illness or injury will not, however, be considered an alternate location.
41 C.F.R. §301-70.505
Note to § 301-70.505: An alternate location is a destination other than the employee's official station or the point of interruption.