BillShield AI is an AI-powered hospital bill auditing platform designed to help patients identify potential overcharging, duplicate charges, arithmetic errors, and suspicious medical billing practices. Users can upload hospital bills for automated analysis, receive clear explanations of flagged charges, review potential discrepancies, and generate reports to help them seek clarification from hospitals. The project combines AI-assisted analysis with rule-based checks to make medical billing more transparent, understandable, and patient-friendly. Our goal is to empower patients with accessible tools to question billing errors and make more informed healthcare payment decisions.