ICD-10-CM > S00-T88 > S50-S59 > S54 > S54.0 S54.0 Injury of ulnar nerve at forearm level Non-Billable/Non-Specific Applicable To Injury of ulnar nerve NOS Codes S54.00Injury of ulnar nerve at forearm level, unspecified armS54.00XA..., initial encounterS54.00XD..., subsequent encounterS54.00XS..., sequelaS54.01Injury of ulnar nerve at forearm level, right armS54.01XA..., initial encounterS54.01XD..., subsequent encounterS54.01XS..., sequelaS54.02Injury of ulnar nerve at forearm level, left armS54.02XA..., initial encounterS54.02XD..., subsequent encounterS54.02XS..., sequela