Requires health plans, providers, hospitals, labs, imaging centers, and ambulatory surgical centers to give consumers clear, itemized bills and to publish searchable, machine-readable price data. It also forces plan service vendors (TPAs, PBMs, networks) to share detailed claims, payment, and contract data with plan fiduciaries, creates new enforcement tools and civil penalties for noncompliance, and phases in uniform data formats and public posting deadlines from 2026–2027.