ICD-10-CM > S00-T88 > S40-S49 > S44 > S44.9 S44.9 Injury of unspecified nerve at shoulder and upper arm level Non-Billable/Non-Specific Codes S44.90Injury of unspecified nerve at shoulder and upper arm level, unspecified armS44.90XA..., initial encounterS44.90XD..., subsequent encounterS44.90XS..., sequelaS44.91Injury of unspecified nerve at shoulder and upper arm level, right armS44.91XA..., initial encounterS44.91XD..., subsequent encounterS44.91XS..., sequelaS44.92Injury of unspecified nerve at shoulder and upper arm level, left armS44.92XA..., initial encounterS44.92XD..., subsequent encounterS44.92XS..., sequela