ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.8 > S56.80 > S56.809 S56.809 Unspecified injury of other muscles, fascia and tendons at forearm level, unspecified arm Non-Billable/Non-Specific Codes S56.809A..., initial encounterS56.809D..., subsequent encounterS56.809S..., sequela