Wifes Medical Bills on my Credit Report

I am in the process of rebuilding my credit and most of the collections on my file are ready to drop off within a year. The exception, however, is two medical bills in collections from my wife. These were for visits to a doctor and the emergency room a couple years ago. However, I was not the patient and do not feel these should be permitted to be reported on my credit file.

I sent a DV last week to this company and they just called me today. I told the woman that I wanted to communicate via mail but she wanted to discuss the bills. She insists that these are my responsibility and can be reported on my credit, but obviously debt collectors will say anything they want. If it matters, this took place in Kansas, which is not a community property state.

Does anyone have any insite on whether or not I am right and if so, what I need to do from here?

Thanks!