Yes, they are reimbursed as for sickness costs, ie: reimbursement is limited to a maximum of 80-85%.
VERY IMPORTANT: On retirement, Art. 73 of the Staff Regulations no longer applies:
- There is no complementary reimbursement up the 100%
- There is no longer a lump sum payment in case of death
- There is no longer a lump sum payment in case of permanent disability
See also question 30.