ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.9 > S56.90 S56.90 Unspecified injury of unspecified muscles, fascia and tendons at forearm level Non-Billable/Non-Specific Codes S56.901Unspecified injury of unspecified muscles, fascia and tendons at forearm level, right armS56.901A..., initial encounterS56.901D..., subsequent encounterS56.901S..., sequelaS56.902Unspecified injury of unspecified muscles, fascia and tendons at forearm level, left armS56.902A..., initial encounterS56.902D..., subsequent encounterS56.902S..., sequelaS56.909Unspecified injury of unspecified muscles, fascia and tendons at forearm level, unspecified armS56.909A..., initial encounterS56.909D..., subsequent encounterS56.909S..., sequela