Coverage Parity for Medicare Patients Act of 2023

This bill creates a Medicare demonstration program to align coverage standards with private insurance. It would deem certain medical services "reasonable and necessary" for Medicare coverage if they are routinely covered by a majority of private health plans in the same state or Medicare contractor area, are safe/effective, and aren't experimental (unless in a qualifying clinical trial). The program would operate for at least 4 years in 5+ states or jurisdictions, with the Secretary establishing rules for what constitutes "significant coverage" through rulemaking. It directly affects Medicare beneficiaries in participating areas and healthcare providers billing Medicare for covered services meeting these criteria. The bill does not change current Medicare coverage rules but tests a new alignment mechanism.