ICD-10-CM > S00-T88 > S50-S59 > S54 > S54.8 > S54.8X > S54.8X9 S54.8X9 Injury of other nerves at forearm level, unspecified arm Non-Billable/Non-Specific Codes S54.8X9A..., initial encounterS54.8X9D..., subsequent encounterS54.8X9S..., sequela