Wis. Stat. § 54.75

All court records pertinent to the finding of incompetency are closed but subject to access as provided in s. 51.30 or 55.22 or under an order of a court under this chapter. The fact that an individual has been found incompetent and the name of and contact information for the guardian is accessible to any person who demonstrates to the custodian of the records a need for that information.