ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.5 > S56.50 S56.50 Unspecified injury of other extensor muscle, fascia and tendon at forearm level Non-Billable/Non-Specific Codes S56.501Unspecified injury of other extensor muscle, fascia and tendon at forearm level, right armS56.501A..., initial encounterS56.501D..., subsequent encounterS56.501S..., sequelaS56.502Unspecified injury of other extensor muscle, fascia and tendon at forearm level, left armS56.502A..., initial encounterS56.502D..., subsequent encounterS56.502S..., sequelaS56.509Unspecified injury of other extensor muscle, fascia and tendon at forearm level, unspecified armS56.509A..., initial encounterS56.509D..., subsequent encounterS56.509S..., sequela