Recently, the Polish Social Security Institution (ZUS) has been sending out letters regarding the employer's obligation to investigate their employees' sick leave.
Carrying out such investigation is the employer's right (entitlement), not a mandatory statutory duty.
This means that, if this seems reasonable in terms of the employer's interests, the company may initiate such investigation (in particular in case of long-term sick leave, sick leave falling during the holiday season or any other festive season or long weekends).
However, in each case this is the employer's sole decision as to whom (which groups of employees) to investigate, and how to carry out such investigation (it can be done internally, or the employer may request ZUS to check on the sick employee).
Our Polish team supports clients in developing step-by-step internal procedures for investigating employee sick leave.