ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.4 > S66.42 > S66.422 S66.422 Laceration of intrinsic muscle, fascia and tendon of left thumb at wrist and hand level Non-Billable/Non-Specific Codes S66.422A..., initial encounterS66.422D..., subsequent encounterS66.422S..., sequela