A.K.
Here's a link to the US Department of Labor FMLA site http://www.dol.gov/whd/regs/compliance/whdfs28.htm
It says cosmetic surgery is generally not covered, but maybe it would be with a night in the hospital. Check with your doctor and HR person.
Medical and disability-related leave rules: Eligible employees can take up to 12 weeks of leave for treatment of or recovery from serious health conditions. The FMLA's definition of a serious health condition is broader than the definition of a disability, encompassing pregnancy and many illnesses, injuries, impairments, or physical or mental conditions that require multiple treatments and intermittent absences. Generally, things like cosmetic surgery, colds, headaches, and routine medical and dental care are not included. FMLA leave is unpaid, but employers may require employees to concurrently take paid leave, such as accrued vacation or sick leave, or employees may elect to do so.