I use 69801. Here is the lay definition if that helps.
The physician administers drugs such as aminoglycosides, corticosteroids, antibiotics, or local anesthetics into the middle ear through the eardrum (tympanic membrane) to treat inner ear conditions such as Meniere's disease, tinnitus, hearing loss, and certain forms of labyrinthine dysfunction. In a transcanal approach, the physician makes a small incision into the anesthetized tympanic membrane, inserts a small catheter or needle into the middle ear, and infuses the drug.