Question: Is 433.10 a deleted code for procedure 93880? Florida Subscriber Answer: Code 433.10 (Occlusion and stenosis of precerbral arteries; carotid artery; without mention of cerebral infarction) is a diagnosis that can correlate to 93880 (Duplex scan of extracranial arteries; complete bilateral study) or related procedure 93882 (... unilateral or limited study). The Florida Medicare local coverage determination lists 93880 as active (ID L6000). Medicare often requests documentation for the procedure, so be prepared to submit extra paperwork.