ICD-10-CM > S00-T88 > S40-S49 > S44 > S44.8 > S44.8X > S44.8X9 S44.8X9 Injury of other nerves at shoulder and upper arm level, unspecified arm Non-Billable/Non-Specific Codes S44.8X9A..., initial encounterS44.8X9D..., subsequent encounterS44.8X9S..., sequela