The National Institute for Health and Clinical Excellence (NICE) has issued full guidance to the NHS in England, Wales, Scotland and Northern Ireland on functional electrical stimulation for drop foot of central neurological origin.
Drop foot is the inability to lift the foot and toes when walking. It can result from conditions such as stroke, multiple sclerosis or spinal cord injury. Functional electrical stimulation involves stimulation of the peripheral nerves that supply the paralysed muscle using electrodes that may be implanted or placed on the surface of the skin. The aim is to restore muscular function.
Implanted FES electrodes:
A70.1 Implantation of neurostimulator into peripheral nerve
Skin surface FES:
A70.7 Application of transcutaneous electrical nerve stimulator
In addition a site code from chapter Z is assigned depending on the nerve into which the stimulator is implanted or applied.
The ICD-10 code M21.3 Wrist or foot drop (acquired) would also be recorded.