Mid-Year Tier Creep: How Your Insurer Can Quietly Move Your Drug to a More Expensive Category
Insurance plans have broad authority to reclassify covered medications into higher cost-sharing tiers during the plan year, often with minimal notice to affected members. This practice — sometimes called tier creep — can transform an affordable maintenance medication into a significant monthly expense overnight. Learning to monitor your formulary proactively and challenge inappropriate reclassifications is among the most valuable financial skills an insured American can develop.