By December 5, 2005: Billing team must stop using all local Pennsylvania Medicaid codes (W, Y, Z prefixes) and replace with corresponding national HCPCS codes per the crosswalk document. Update billing system to require prior authorization for all specified E, K, L, S, and V codes listed. Configure system to use new pricing modifiers (NU, RR, RT, LT, 50, U7, U8, U9, UB, U4) as specified in fee schedule. Claims using old local codes will be denied after effective date.