I went thru a lawyer for disabilty due to have my leg amputated i was approved but never got backpay how do i go about getting approved for back pay

You would call the attorney or local SSDI office and ask them if you were to receive back pay.  This is determined based on a number factors including your Original Onset Date of Disability under the law.    Attorney Scott F. Bocchio Legal Rights Advocates P 855-254-7841 www.yourlegalrightsadvocates.com