ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.5 > S56.51 > S56.512 S56.512 Strain of other extensor muscle, fascia and tendon at forearm level, left arm Non-Billable/Non-Specific Codes S56.512A..., initial encounterS56.512D..., subsequent encounterS56.512S..., sequela