Ask Dr. Z

I have a diagnosis question. The patient comes in for a follow-up TEE after having a Watchman implanted. If the TEE shows appendage closure, the patient will be maintained on antiplatelet therapy per the H&P. The indication on the TEE report says "Watchman Follow-up". Should the primary diagnosis be Z09, Encounter for follow-up after completed treatment for conditions other than malignant neoplasm; Z48.812, Encounter for surgical aftercare following surgery on the circulatory system (which is the diagnosis the encoder comes up with if you choose condition requires additional treatment); or the atrial fibrillation code followed by Z95.818, Presence of other cardiac implants and grafts?