ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.4 > S56.41 > S56.418 S56.418 Strain of extensor muscle, fascia and tendon of left little finger at forearm level Non-Billable/Non-Specific Codes S56.418A..., initial encounterS56.418D..., subsequent encounterS56.418S..., sequela