ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.9 > S56.99 > S56.992 S56.992 Other injury of unspecified muscles, fascia and tendons at forearm level, left arm Non-Billable/Non-Specific Codes S56.992A..., initial encounterS56.992D..., subsequent encounterS56.992S..., sequela