ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.5 > S56.59 > S56.592 S56.592 Other injury of other extensor muscle, fascia and tendon at forearm level, left arm Non-Billable/Non-Specific Codes S56.592A..., initial encounterS56.592D..., subsequent encounterS56.592S..., sequela