Liposuction is possible for someone who weighs 400 pounds but is not recommended. Liposuction at this weight and body mass index will only produce complications. It's best to be close to your goal weight prior to any body contouring surgery.
At 400 lbs liposuction would likely pose a health risk. As a cosmetic case, most plastic surgeons would not perform that case as the most important principle is 'do no harm'. However, in ANY city, there is someone that would perform any case as long as you have the money. Be careful and take care.
