ICD-10-CM > S00-T88 > S60-S69 > S66 > S66.3 > S66.39 > S66.390 S66.390 Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level Non-Billable/Non-Specific Codes S66.390A..., initial encounterS66.390D..., subsequent encounterS66.390S..., sequela