No. Medical certification is not required to change the gender options on your TSA PreCheck® application. If you are a member of the TSA PreCheck® Application Program, you may call (855) 347-8371 weekdays, between 8 a.m. and 10 p.m. ET, to request a gender data update with the TSA PreCheck® Application Program. Please note, updating your gender is not required to receive TSA PreCheck® screening. You are eligible to receive TSA PreCheck® screening even if your current gender differs from the gender you provided when you enrolled in TSA PreCheck®, as long as the name and date of birth on your reservation match the name and date of birth on record with TSA.