ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.8 > S56.80 S56.80 Unspecified injury of other muscles, fascia and tendons at forearm level Non-Billable/Non-Specific Codes S56.801Unspecified injury of other muscles, fascia and tendons at forearm level, right armS56.801A..., initial encounterS56.801D..., subsequent encounterS56.801S..., sequelaS56.802Unspecified injury of other muscles, fascia and tendons at forearm level, left armS56.802A..., initial encounterS56.802D..., subsequent encounterS56.802S..., sequelaS56.809Unspecified injury of other muscles, fascia and tendons at forearm level, unspecified armS56.809A..., initial encounterS56.809D..., subsequent encounterS56.809S..., sequela