Protecting Access to Spinal Surgeries Act This bill extends an exception to the application of site-neutral payment rates under the Medicare inpatient prospective payment system. Currently, certain long-term care hospitals that primarily treat spinal cord injuries are excluded from such payment rates through FY2019 if they meet certain other criteria (e.g., a significant number of discharges of out-of-state patients in FY2014). The bill extends this exception through FY2024.