ICD-10-CM > S00-T88 > S40-S49 > S40 > S40.9 > S40.92 > S40.921 S40.921 Unspecified superficial injury of right upper arm Non-Billable/Non-Specific Codes S40.921A..., initial encounterS40.921D..., subsequent encounterS40.921S..., sequela