ICD-10-CM > S00-T88 > S50-S59 > S55 > S55.9 > S55.90 > S55.909 S55.909 Unspecified injury of unspecified blood vessel at forearm level, unspecified arm Non-Billable/Non-Specific Codes S55.909A..., initial encounterS55.909D..., subsequent encounterS55.909S..., sequela