ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.4 > S56.49 > S56.491 S56.491 Other injury of extensor muscle, fascia and tendon of right index finger at forearm level Non-Billable/Non-Specific Codes S56.491A..., initial encounterS56.491D..., subsequent encounterS56.491S..., sequela