ICD-10-CM > S00-T88 > S50-S59 > S54 > S54.0 > S54.00 S54.00 Injury of ulnar nerve at forearm level, unspecified arm Non-Billable/Non-Specific Codes S54.00XA..., initial encounterS54.00XD..., subsequent encounterS54.00XS..., sequela