ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.4 > S56.41 S56.41 Strain of extensor muscle, fascia and tendon of other and unspecified finger at forearm level Non-Billable/Non-Specific Codes S56.411Strain of extensor muscle, fascia and tendon of right index finger at forearm levelS56.411A..., initial encounterS56.411D..., subsequent encounterS56.411S..., sequelaS56.412Strain of extensor muscle, fascia and tendon of left index finger at forearm levelS56.412A..., initial encounterS56.412D..., subsequent encounterS56.412S..., sequelaS56.413Strain of extensor muscle, fascia and tendon of right middle finger at forearm levelS56.413A..., initial encounterS56.413D..., subsequent encounterS56.413S..., sequelaS56.414Strain of extensor muscle, fascia and tendon of left middle finger at forearm levelS56.414A..., initial encounterS56.414D..., subsequent encounterS56.414S..., sequelaS56.415Strain of extensor muscle, fascia and tendon of right ring finger at forearm levelS56.415A..., initial encounterS56.415D..., subsequent encounterS56.415S..., sequelaS56.416Strain of extensor muscle, fascia and tendon of left ring finger at forearm levelS56.416A..., initial encounterS56.416D..., subsequent encounterS56.416S..., sequelaS56.417Strain of extensor muscle, fascia and tendon of right little finger at forearm levelS56.417A..., initial encounterS56.417D..., subsequent encounterS56.417S..., sequelaS56.418Strain of extensor muscle, fascia and tendon of left little finger at forearm levelS56.418A..., initial encounterS56.418D..., subsequent encounterS56.418S..., sequelaS56.419Strain of extensor muscle, fascia and tendon of finger, unspecified finger at forearm levelS56.419A..., initial encounterS56.419D..., subsequent encounterS56.419S..., sequela