ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.1 > S66.11 > S66.111 S66.111 Strain of flexor muscle, fascia and tendon of left index finger at wrist and hand level Non-Billable/Non-Specific Codes S66.111A..., initial encounterS66.111D..., subsequent encounterS66.111S..., sequela