40 ILCS 5/11-155
An employee who becomes disabled on or after the effective date while under age 65 and prior to January 1, 1979 or while under age 70 after January 1, 1979 as the result of injury incurred on or after the date he has been included under this Article in the performance of an act or acts of duty, shall have a right to receive duty disability benefit, during any period of such disability for which he receives no salary. The benefit shall be 75% of salary at date of injury; provided, that if disability, in any measure, has resulted from any mental disorder, physical defect or disease which existed at the time such injury was sustained the duty disability benefit shall be 50% of salary at date of such injury.
If the employee's duty disability benefit continues for more than 5 years, the benefit shall be increased by 10% on January 1 of the sixth year.
Disablement because of commonly termed heart attacks, or strokes, or any disablement falling within the broad field of coronary involvement or heart disease, shall not be considered to be the result of an accidental injury incurred in the performance of duty.
The employee shall also have a right to receive child's disability benefit of $10 a month on account of each unmarried child (the issue of the employee) less than age 18. Child's disability benefits shall not exceed 15% of the salary as aforesaid.
If application for duty disability benefit is not filed with the Retirement Board within one year from the date the disability applicant became disabled or last received salary, if salary was continued during the period of disablement, no duty disability benefit shall begin to accrue for any period of time more than one year prior to the date on which the application for disability benefit is received by the Board.
The first payment of duty disability or child's disability benefit shall be made not later than one month after such benefit is granted and each subsequent payment shall be made not later than one month after the last preceding payment.
Duty disability benefit is payable during disability until the employee attains age 65 if the disability commences prior to January 1, 1979. If the disability commences after January 1, 1979 the benefit prescribed herein shall be payable during disability until the employee attains age 65 for disability commencing prior to age 60, or for a period of 5 years or until attainment of age 70, whichever occurs first, for disability commencing at age 60 or older and after January 1, 1979, and child's disability benefit shall be paid to the employee parent of any unmarried child (the issue of the employee) less than age 18, during such time until the child marries or attains age 18. The employee shall thereafter receive such annuity as is otherwise provided in this Article.
Any employee whose duty disability benefit was terminated after January 1, 1979 by reason of his attainment of age 65 and who continues disabled after age 65 may elect before July 1, 1986 to have such benefits resumed beginning at the time of such termination and continuing until termination is required under this Section as amended by this amendatory Act of 1985. The amount payable to any employee for such resumed benefit for any period shall be reduced by the amount of any retirement annuity paid to such employee under this Article for the same period of time or by any refund paid in lieu of an annuity.
40 ILCS 5/11-155