ICD-10-CM > S00-T88 > S40-S49 > S44 > S44.4 S44.4 Injury of musculocutaneous nerve Non-Billable/Non-Specific Codes S44.40Injury of musculocutaneous nerve, unspecified armS44.40XA..., initial encounterS44.40XD..., subsequent encounterS44.40XS..., sequelaS44.41Injury of musculocutaneous nerve, right armS44.41XA..., initial encounterS44.41XD..., subsequent encounterS44.41XS..., sequelaS44.42Injury of musculocutaneous nerve, left armS44.42XA..., initial encounterS44.42XD..., subsequent encounterS44.42XS..., sequela