Skip to content

Bills · 2025-2026 Regular Session

AB 400

Died at session end Official bill text Atom feed

Relating to: a civil cause of action for a minor injured by a gender transition procedure.

Court — Procedure Damage personal injury Medical service Mental health Physician Youth

  1. Introduced, stopped here
  2. Passes Assembly, not reached
  3. Passes Senate, not reached
  4. Governor signs, not reached
  5. Law, not reached

Unfamiliar terms? Glossary

What this bill does

Plain-language analysis by the nonpartisan Legislative Reference Bureau

This bill establishes a civil cause of action against a health care provider who performs a gender transition procedure, as defined in the bill, on an individual who is under 18 years of age and who is injured, including any physical, psychological, emotional, or physiological injury, by the gender transition procedure or related treatment or the aftereffects of the gender transition procedure or related treatment. Under the bill, such an action must be commenced before the individual attains the age of 33 years.

The bill provides that it is a defense to an action under the bill if all of the following occur before a health care provider performs a gender transition procedure on an individual who is under 18 years of age:

1. The health care provider documents the individual’s perceived gender or perceived sex for at least two continuous years, and the individual’s perceived gender or perceived sex is invariably inconsistent with the individual’s biological sex throughout the two-year period.

2. To the extent that the individual suffers from a mental health concern, at least one mental health professional and one other health care provider certifies in writing that the gender transition procedure is the only way to treat the mental health concern.

3. At least one mental health professional and one other health care provider certifies in writing that the individual suffers from no other mental health concerns.

4. The health care provider receives the voluntary and informed consent of the individual and the individual’s parent or legal guardian by providing them, both orally and in writing, with a notice, the contents are which are prescribed in the bill, at least 30 days before the first treatment of the gender transition procedure and during every subsequent medical visit for treatment during the following six months.

Sponsors

Introduced by: Allen (R) , Behnke (R) , Brill (R) , Dittrich (R) , Green (R) , Knodl (R) , Kreibich (R) , Maxey (R) , Murphy (R) , Mursau (R) , Nedweski (R) , O'Connor (R) , Penterman (R) , Piwowarczyk (R) , Steffen (R) , Wichgers (R)

4 cosponsors

Bradley (R) , Hutton (R) , Kapenga (R) , Nass (R)

Registered lobbying interests · 18

Organizations that registered lobbying activity on this bill with the Wisconsin Ethics Commission. Registration means interest, not a position for or against. Official record

Votes

Assembly: Report passage recommended by Committee on Judiciary, Ayes 5, Noes 3

Passed 5–3 Jan 15, 2026 official source full page

No individual roll call was recorded for this vote. Committee votes and some older sessions record totals only.

Full history

  1. Aug 29, 2025 · Assembly

    Introduced by Representatives Nedweski, Steffen, Allen, Behnke, Brill, Dittrich, Green, Knodl, Kreibich, Maxey, Murphy, Mursau, O'Connor, Penterman, Piwowarczyk and Wichgers; cosponsored by Senators Hutton, Kapenga, Bradley and Nass

  2. Aug 29, 2025 · Assembly

    Read first time and referred to Committee on Judiciary

  3. Jan 8, 2026 · Assembly

    Public hearing held

  4. Jan 14, 2026 · Assembly

    Executive action taken

  5. Jan 15, 2026 · Assembly

    Report passage recommended by Committee on Judiciary, Ayes 5, Noes 3

  6. Jan 15, 2026 · Assembly

    Referred to committee on Rules

  7. Feb 10, 2026 · Assembly

    Placed on calendar 2-12-2026 by Committee on Rules

  8. Feb 11, 2026 · Assembly

    Assembly Amendment 1 offered by Representative Nedweski

  9. Feb 12, 2026 · Assembly

    Laid on the table

  10. Mar 23, 2026 · Assembly

    Failed to pass pursuant to Senate Joint Resolution 1