Billing in assistant living sitting

One of our Neurologists saw a patient in an assistant living facility; we used E/M cods 99308 for initial visit & 99307 for follow up visit with POS 13
Our claims were denied twice. by Medicare. can you please advice.
thanks

Oct 3rd, 2013 - nmaguire 2,606

re: Billing in assistant living sitting

Accurate CPT® codes are 99324-99337 for POS 13.