: HHS is issuing this final rule (herein referred to as ``this rule'') to add vascularized composite allografts (VCAs) as specified herein to the definition of organs covered by the rules governing the operation of the Organ Procurement and Transplantation Network (OPTN) (herein referred to as the OPTN final rule). When it enacted the National Organ Transplant Act in 1984, Congress included a definition of the term organ and authorized the Secretary to expand this definition by regulation. The Secretary has previously exercised this authority and expanded the statutory definition of organ. Prior to this rule, the OPTN final rule defined covered organs as ``a human kidney, liver, heart, lung, or pancreas, or intestine (including the esophagus, stomach, small and/or large intestine, or any portion of the gastrointestinal tract). Blood vessels recovered from an organ donor during the recovery of such organ(s) are considered part of an organ with which they are procured for purposes of this part if the vessels are intended for use in organ transplantation and labeled `For use in organ transplantation only.' '' This rule also includes a corresponding change to the definition of human organs covered by section 301 of the National Organ Transplant Act of 1984, as amended (NOTA).