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