ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.2 > S66.22 > S66.221 S66.221 Laceration of extensor muscle, fascia and tendon of right thumb at wrist and hand level Non-Billable/Non-Specific Codes S66.221A..., initial encounterS66.221D..., subsequent encounterS66.221S..., sequela