ICD-10-CM > S00-T88 > T80-T88 > T85 > T85.8 > T85.85 > T85.850 T85.850 Stenosis due to nervous system prosthetic devices, implants and grafts Non-Billable/Non-Specific Codes T85.850A..., initial encounterT85.850D..., subsequent encounterT85.850S..., sequela