Is my retirement disability benefit considered income?

I was medically discharged from the fire department and am receiving disability benefits from them. It's through the Kansas Public Employee Retirement System. They do not provide much information other than it's not state taxable, but they do take federal taxes from it. I'm curious if I have to report it as income on any state forms (i.e unemployment, etc.). I'm not eligible for SSDI and that's all most of the forms refer to.

Thanks!