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