ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.8 > S56.81 S56.81 Strain of other muscles, fascia and tendons at forearm level Non-Billable/Non-Specific Codes S56.811Strain of other muscles, fascia and tendons at forearm level, right armS56.811A..., initial encounterS56.811D..., subsequent encounterS56.811S..., sequelaS56.812Strain of other muscles, fascia and tendons at forearm level, left armS56.812A..., initial encounterS56.812D..., subsequent encounterS56.812S..., sequelaS56.819Strain of other muscles, fascia and tendons at forearm level, unspecified armS56.819A..., initial encounterS56.819D..., subsequent encounterS56.819S..., sequela