Here is the situation: dr X saw patient Y for lower left quadrant scaling and root planing using mandibular block anesthesia. He then used an antibacterial gel in each sulcus. while the patient was in the office he reviewed the patient’s progress on smoking cessation and went over the results of a biopsy done on a previous visit. how do i code that?

Codes are as follows:
Root planning and scaling will depend on how many teeth in the quadrant were scaled...you will either use D4341 for 4 or more teeth or D4342 one to three teeth. The anesthesia is included in this procedure and therefore has no code.
D9610 will be used for the antibacterial gel
D1320 will be used for the tobacco cessation/counseling
D0140 will be used for the results of the biopsy performed