This document provides an overview of changes to HIPAA electronic transactions required for 5010 compliance effective January 1, 2012. Key changes include new standards for 837 claims, 270/271 eligibility inquiries, 999 acknowledgements, and other transactions. Providers must update their billing software and practices to address updated fields, codes, and requirements to remain compliant for electronic billing to MassHealth and other payers. Testing is encouraged before the January 1, 2012 deadline to ensure a smooth transition.