ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.8 > S56.89 S56.89 Other injury of other muscles, fascia and tendons at forearm level Non-Billable/Non-Specific Codes S56.891Other injury of other muscles, fascia and tendons at forearm level, right armS56.891A..., initial encounterS56.891D..., subsequent encounterS56.891S..., sequelaS56.892Other injury of other muscles, fascia and tendons at forearm level, left armS56.892A..., initial encounterS56.892D..., subsequent encounterS56.892S..., sequelaS56.899Other injury of other muscles, fascia and tendons at forearm level, unspecified armS56.899A..., initial encounterS56.899D..., subsequent encounterS56.899S..., sequela