ICD-10-CM > S00-T88 > S50-S59 > S55 > S55.9 > S55.99 > S55.999 S55.999 Other specified injury of unspecified blood vessel at forearm level, unspecified arm Non-Billable/Non-Specific Codes S55.999A..., initial encounterS55.999D..., subsequent encounterS55.999S..., sequela