By March 31, 2026: Billing team must (1) Update billing system to recognize new payable codes (C9309, J0463, J1164, J3404, J8502, J9183, J9277, J9278, J9601, Q5161, Q5162, A4318, A6548, L5992) with appropriate provider type restrictions and prior authorization requirements as documented in Section II; (2) Configure prior authorization mandates in billing software for codes C9309, J3404, J8502, J9183, J9277, J9601, Q5161, Q5162, A6548, and L5992 (NU modifier) based on provider contract type; (3) Implement age and diagnosis group restrictions in billing system for relevant codes (e.g., J9277 requires age 12+; J9278 requires diagnosis group 603 for ages 21+); (4) Stop accepting claims on or after April 1, 2026 using terminated codes C9145, C9307, C9308, L6000, L6010, L6020—flag these as non-payable; (5) Prepare for mass claim adjustments: identify all claims paid with terminated codes for dates of service after March 31, 2026 and initiate recoupment process per Arkansas DHS requirements; (6) Submit all claim adjustments and revisions to prior authorizations before the 365-day filing deadline; (7) For drug procedure codes, ensure NDC billing protocol is applied (exemptions: radiopharmaceuticals, vaccines, allergen immunotherapy); (8) Educate billing staff and providers on new code utilization and PA requirements. Failure to implement these changes will result in claim denials and recoupment of improperly paid claims.