I'm Doug, and I'm very sorry to hear of your situation. My goal is to provide you with excellent service today.
Under Kansas law, there is not code section requiring that you advise a potential tenant of a known bedbug infestation. However, that does not protect you and your employer from being sued if you knowingly fail to disclose such a pervasive and expensive infestation to deal with.
You could be sued at a minimum for negligence and the tenant could then seek to terminate any lease agreement they had, as well as seek damages against you and your employer for any furnishings that had to be replaced because they were not capable of being treated, and for the full cost of eradication by an expert service of their belongings. This could easily run in to the thousands of dollars in damages.
The fact that there may not be a law compelling disclosure will not insulate you from a lawsuit. And you are correct---you have an ethical obligation to tell prospective tenants. Keeping something like this hidden from the public could become a public relations nightmare for your company---imagine what the BBB would do with information like that?
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I wish you and yours the best in 2016,