Read the Center for Medicare & Medicaid Service's compliance reminder for EMS agencies that perform Advanced Life Support Ambulance Services. The bulletin focuses on the high number of errors related to insufficient documentation for ALS transports, highlighting the 2015 Comprehensive Error Rate Testing (CERT) Report that reflected an improper payment rate for ALS services of $226 million. Most errors occur when documentation: Does not support the medical necessity of the ALS level of service Lacks the patient’s signature authorizing the supplier to bill Medicare for the service