ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.1 > S56.12 > S56.121 S56.121 Laceration of flexor muscle, fascia and tendon of right index finger at forearm level Non-Billable/Non-Specific Codes S56.121A..., initial encounterS56.121D..., subsequent encounterS56.121S..., sequela