ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.4 > S56.41 > S56.413 S56.413 Strain of extensor muscle, fascia and tendon of right middle finger at forearm level Non-Billable/Non-Specific Codes S56.413A..., initial encounterS56.413D..., subsequent encounterS56.413S..., sequela