ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.5 > S66.52 > S66.521 S66.521 Laceration of intrinsic muscle, fascia and tendon of left index finger at wrist and hand level Non-Billable/Non-Specific Codes S66.521A..., initial encounterS66.521D..., subsequent encounterS66.521S..., sequela