You are correct in that you do not code for the dx not addressed in the assesment as treated or controlled or managed in this encounter, unless it is a condition known to be comorbid, that is any condition that complicates the management of the patient's condition. Such as diabetes or HIV + status. Also think of things like a patient with a joint fx that also has HTN, the HTN is an important comorbid condition for a patient with a joint fx due to the increased risk of PE.