Illinois Statutes Chapter 820. Employment § 191/10. Use of leave; limitations

(a) An employee may use personal sick leave benefits provided by the employer for absences due to an illness, injury, or medical appointment of the employee's child, stepchild, spouse, domestic partner, sibling, parent, mother-in-law, father-in-law, grandchild, grandparent, or stepparent, or for personal care of a covered family member on the same terms upon which the employee is able to use personal sick leave benefits for the employee's own illness or injury. An employer may request written verification of the employee's absence from a health care professional if such verification is required under the employer's employment benefit plan or paid time off policy.

(b) An employer may limit the use of personal sick leave benefits provided by the employer for absences due to an illness, injury, medical appointment, or personal care of the employee's covered family member to an amount not less than the personal sick leave that would be earned or accrued during 6 months at the employee's then current rate of entitlement. For employers who base personal sick leave benefits on an employee's years of service instead of annual or monthly accrual, such employer may limit the amount of sick leave to be used under this Act to half of the employee's maximum annual grant.

(c) An employer who provides personal sick leave benefits or a paid time off policy that would otherwise provide benefits as required under subsections (a) and (b) shall not be required to modify such benefits.