If my loved one has been the victim of suspected abuse in a rehab facility, does that fall under medical malpractice? Who should I contact?

If a loved one was physically or sexually abused in a health care facility, the answer to  your question is yes; it would fall under malpractice and negligence. Consult with an experienced personal injury lawyer as soon as possible. The statute of limitations in Wisconsin for injury or malpractice is 3 years from the date of the occurrence; failure to file a lawsuit within  three years would forever bar the claim; if this is a governmental facility, you also are required to provide 120 days written notice by filing a notice of claim by personally serving the same on the responsible governmental agency from the date of the occurrence or otherwise,  the claim would also be forever bsrrrd.