Thermage can be used almost anywhere on the body. It's typically a one-time treatment; practitioners base the cost according to the body part treated. For example, a doctor may have a Thermage charge for "face" and another charge for "stomach." The charge for an individual body part can range anywhere from $1,500 to $5,000, depending on the size of the area treated.
Some doctors will further refine the cost structure by charging separately for the neck and facial features like the chin and eyes. Ask your doctor what is included in any given treatment area or in packages like "body contouring."