ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.2 > S66.22 S66.22 Laceration of extensor muscle, fascia and tendon of thumb at wrist and hand level Non-Billable/Non-Specific Codes S66.221Laceration of extensor muscle, fascia and tendon of right thumb at wrist and hand levelS66.221A..., initial encounterS66.221D..., subsequent encounterS66.221S..., sequelaS66.222Laceration of extensor muscle, fascia and tendon of left thumb at wrist and hand levelS66.222A..., initial encounterS66.222D..., subsequent encounterS66.222S..., sequelaS66.229Laceration of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand levelS66.229A..., initial encounterS66.229D..., subsequent encounterS66.229S..., sequela