ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.0 > S66.02 S66.02 Laceration of long flexor muscle, fascia and tendon of thumb at wrist and hand level Non-Billable/Non-Specific Codes S66.021Laceration of long flexor muscle, fascia and tendon of right thumb at wrist and hand levelS66.021A..., initial encounterS66.021D..., subsequent encounterS66.021S..., sequelaS66.022Laceration of long flexor muscle, fascia and tendon of left thumb at wrist and hand levelS66.022A..., initial encounterS66.022D..., subsequent encounterS66.022S..., sequelaS66.029Laceration of long flexor muscle, fascia and tendon of unspecified thumb at wrist and hand levelS66.029A..., initial encounterS66.029D..., subsequent encounterS66.029S..., sequela