ICD-10-CM > S00-T88 > S50-S59 > S54 > S54.9 S54.9 Injury of unspecified nerve at forearm level Non-Billable/Non-Specific Codes S54.90Injury of unspecified nerve at forearm level, unspecified armS54.90XA..., initial encounterS54.90XD..., subsequent encounterS54.90XS..., sequelaS54.91Injury of unspecified nerve at forearm level, right armS54.91XA..., initial encounterS54.91XD..., subsequent encounterS54.91XS..., sequelaS54.92Injury of unspecified nerve at forearm level, left armS54.92XA..., initial encounterS54.92XD..., subsequent encounterS54.92XS..., sequela