Watch for an announce from your Medicare Administrative Contractor (MAC) with details on how to register and participate in this important event. All HIPAA covered entities are required to transition from ICD-9-CM to ICD-10-CM/PCS on October 1, 2014. It is very important that your claims with the new codes can be sent and received in order to minimize disruption during the transition. For more information, please see CMS MLM 8465.