ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.1 > S66.19 > S66.191 S66.191 Other injury of flexor muscle, fascia and tendon of left index finger at wrist and hand level Non-Billable/Non-Specific Codes S66.191A..., initial encounterS66.191D..., subsequent encounterS66.191S..., sequela