Wiki Appendix L in CPT-2012 book

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Can anyone give me a site to go to that I may clarify the Appendix L in the CPT book? I am enrolled in a coding course and am really enjoying it up until this Chapter. We are starting on the cardiovascular system and I am trying to make sense of the Appendix L in the CPT book where it talks about and has a graph of the vascular families. Would anyone know of a video that would explain it better or a great web site to go to for a breakdown? :confused: