ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.0 > S56.02 > S56.021 S56.021 Laceration of flexor muscle, fascia and tendon of right thumb at forearm level Non-Billable/Non-Specific Codes S56.021A..., initial encounterS56.021D..., subsequent encounterS56.021S..., sequela