ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.9 > S56.91 > S56.919 S56.919 Strain of unspecified muscles, fascia and tendons at forearm level, unspecified arm Non-Billable/Non-Specific Codes S56.919A..., initial encounterS56.919D..., subsequent encounterS56.919S..., sequela