Modern surgical technology makes it possible to construct a natural-looking breast after mastectomy (breast removal) for cancer or other diseases. The procedure is commonly begun and sometimes completed immediately following mastectomy, so that the patient wakes with a new breast mound instead of no breast at all. Alternatively, reconstruction may begin years after mastectomy. Insurance companies cover reconstruction following breast cancer surgery, and Congress has legislated to make coverage mandatory. Also, in the state of California, procedures on the contralateral breast for symmetry are mandated for insurance coverage as well.