Missouri Revised Statutes Title VI. County, Township and Political Subdivision Government § 57.982. Disability benefits--effect of return to employment--disability beneficiary becomes normal retiree, when

1. Any active member of the system who is terminated from active employment as a result of an injury or illness received in the performance of the member's duty, as determined by the board, or any active member who is terminated because of an injury or illness not received in the performance of his duty and the member has five or more years of creditable service, may be placed on disability leave and shall be entitled to receive a monthly disability leave benefit equal to eighty percent of the member's monthly average final compensation decreased by the member's primary federal Social Security benefit.

2. A member shall be deemed eligible for disability benefits only when it is determined by the board that the member is entitled to disability benefits under the Federal Social Security Act.  1

3. A member on disability leave who has not accrued at least eight years of creditable service shall accrue membership service for the period from the effective date of disability leave, as approved by the board, until the member has accrued eight years of creditable service.

4. The maximum benefit period for disability leave payments shall be from the date disability payments begin until age sixty-five or when the member accrues eight years of creditable service whichever later occurs. A member cannot receive disability leave benefits and retirement benefits concurrently.

5. Monthly disability leave benefits described herein shall not be paid to any member who is no longer receiving disability payments from Social Security. At that time, the member's disability leave shall be terminated and the member shall be eligible for any benefits that the member is entitled to by reason of his age and creditable service or in the case of his returning to work he may be reinstated as an active member under rules and procedures adopted by the board.

6. Members receiving disability leave benefits shall be eligible for medical insurance benefits under subsection 2 of section 57.967 but shall not be eligible for the increase in benefits provided by section 57.968.

7. A member who retires while on disability leave shall be considered a normal retiree and section 57.979 shall be applicable.

8. If a vested member who is receiving disability leave benefits dies before retirement, he shall be considered to have retired on the date of death and the member's spouse, if married to the member for two years or more immediately prior to the member's death, shall be entitled to the survivor benefit under option 1 of section 57.979.

9. Other rules and procedures necessary for the operation and administration of disability benefits shall be established by the board in accordance with chapter 536.