RESUMEN
CONTEXT: Bans on gender-affirming care (GAC) for transgender and gender-expansive (TGE) people are grounded in scientific disinformation and have been challenged in American courts. METHODS: Five legal filings by state officials in defense of GAC restriction from initial litigation were analyzed using reflexive thematic analysis. Themes and subthemes of disinformation were identified after review and analysis of these filings. FINDINGS: Five themes of disinformation emerged: False and misleading claims about (1) gender dysphoria and gender identity, (2) the evidence regarding GAC, (3) standard practice of GAC, (4) the safety of GAC, and finally, (5) rejection of medical authority. These themes were well represented across the analyzed documents. CONCLUSIONS: The five disinformation themes and subthemes have been noted in lower courts, but have seen some purchase in appellate courts, suggesting that medical disinformation in law may have far-reaching consequences for medical policy.