ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.0 > S66.02 > S66.021 S66.021 Laceration of long flexor muscle, fascia and tendon of right thumb at wrist and hand level Non-Billable/Non-Specific Codes S66.021A..., initial encounterS66.021D..., subsequent encounterS66.021S..., sequela