A 2023 lawsuit revealed that UnitedHealth Group used an AI algorithm called nH Predict to systematically deny post-acute care claims for Medicare Advantage patients. The AI had a 90% denial rate even when doctors said care was medically necessary. Elderly patients were discharged from nursing facilities before recovering, and some died. A federal judge called UnitedHealth's conduct 'shameful' and allowed the lawsuit to proceed. The case exposed how AI was being weaponized to maximize insurance company profits.