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