Body integrity identity disorder is a rare condition in which a patient will report a strong desire for one or more of their healthy limbs to either be amputated or be rendered non-functional. The disorder is not currently included in DSM V or ICD-10.
Source: Müller, S. (2009). Body integrity identity disorder (BIID)—Is the amputation of healthy limbs ethically justified? American Journal of Bioethics, 9, 36–43.