If it is necessary to justify an employee's temporary incapacity to work (caused by illness or the need to provide care to a sick family member), a certificate will be issued on the ZUS ZLA form.

In order for such a certificate, i.e. sick leave, to be valid, it is necessary to provide the following data on the ZUS ZLA form:

1. by the person issuing the ZLA:

   – name and surname of the insured person,

   – the address where the person will stay during the period of sick leave,

   – date of discharge, medical indications and discharge letter code,

2. by patient:

   – PESEL number of the insured person (or passport series and number if no PESEL number has been assigned),

   – Tax Identification Number of the employer.

If you are employed by more than one company, it will be necessary to issue a separate certificate for each employer, i.e. provide the Tax Identification Number (NIP) of each contribution payer.

The ZUS ZLA form is intended for employees in an employment relationship. People employed in another form do not receive such a form. Those insured in KRUS may - on the basis of a medical certificate of temporary incapacity for work due to illness, issued on the ZUS ZLA form - apply for sickness benefit. It is due for each day of incapacity for work lasting continuously for at least 30 days, but no longer than 180 days.