40 ILCS 5/9-157
An employee while under age 65 and prior to January 1, 1979, or while under age 70 and after January 1, 1979, but prior to January 1, 1987, and regardless of age on or after January 1, 1987, who becomes disabled after becoming a contributor to the fund as the result of any cause other than injury incurred in the performance of an act of duty is entitled to ordinary disability benefit during such disability, after the first 30 days thereof.
No employee who becomes disabled and whose disability commences during any period of absence from duty without pay may receive ordinary disability benefit until he recovers from such disability and performs the duties of his position in the service for at least 15 consecutive days, Sundays and holidays excepted, after his recovery from such disability.
The benefit shall not be allowed unless application therefor is made while the disability exists, nor for any period of disability before 30 days before the application for such benefit is made. The foregoing limitations do not apply if the board finds from satisfactory evidence presented to it that there was reasonable cause for delay in filing such application within such periods of time.
The first payment shall be made not later than one month after the benefit is granted and each subsequent payment shall be made not later than one month after the last preceding payment.
The disability benefit prescribed herein shall cease when the first of the following dates shall occur and the employee, if still disabled, shall thereafter be entitled to such annuity as is otherwise provided in this Article:
Any employee whose duty disability benefit was terminated on or after January 1, 1979 by reason of his attainment of age 65 and who continues to be 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 annuity.
Any employee whose disability benefit was terminated on or after January 1, 1987 by reason of his attainment of age 70, and who continues to be disabled after age 70, may elect before March 31, 1988, 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 1987. 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 annuity.
Ordinary disability benefit shall be 50% of the employee's salary at the date of disability. Instead of all amounts ordinarily contributed by an employee and by the county for age and service annuity and widow's annuity based on the salary at date of disability, the county shall contribute sums equal to such amounts for any period during which the employee receives ordinary disability and such is deemed for annuity and refund purposes as amounts contributed by him. The county shall also contribute 1/2 of 1% salary deductions required as a contribution from the employee under Section 9-133.
An employee who has withdrawn from service or was laid off for any reason, who is absent from service thereafter for 60 days or more who re-enters the service subsequent to such absence is not entitled to ordinary disability benefit unless he renders at least 6 months of service subsequent to the date of such last re-entry.
40 ILCS 5/9-157