Final answer:
CPT codes for a round window implant with a floating mass transducer vary, and without specific code options, the exact CPT code cannot be given. Medical professionals must consult the CPT manual to find the correct code for the procedure.
Step-by-step explanation:
The correct CPT® code for a round window implant with floating mass transducer used to treat severe mixed hearing loss due to chronic otitis media is specific to the type of device implanted and the exact nature of the procedure. CPT codes for implantable hearing devices are often located in the range of 69700-69714. However, without specific code choices provided, it's not possible to give a definitive CPT code. The details provided about the patient's hearing loss, such as the loss at 4000 Hz and the distinction between nerve damage and middle ear damage made by bone conduction tests, are pertinent for clinical diagnosis but do not directly determine the CPT code. Medical professionals would consult the Current Procedural Terminology (CPT) manual to find the exact code that corresponds to the surgical procedure performed.