32 Miss. Code. R. 1-6.4
Medicaid will follow Medicare policy and allow providers to obtain a lifetime authorization from the Medicaid applicant/client to submit Medicaid claims. This authorization must be signed at the time an application is taken. This authorization must be retained in the client's case file. Be sure the applicant/client signs his/her name. If the applicant/client cannot write his/her name, he/she should sign by a mark and a have a witness sign the applicant's/client's name and indicate by whom the name was entered. If the applicant/client is a minor or otherwise unable to sign, any responsible person such as a parent or guardian must enter the recipient's name and write "By," sign his/her own name and address in the space, show his/her relationship to the applicant/client and explain briefly why the applicant/client cannot sign.
See Resource Guide for Signature On File Form, (HCBS Resource Guide).
32 Miss. Code. R. 1-6.4