ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.5 > S56.51 > S56.519 S56.519 Strain of other extensor muscle, fascia and tendon at forearm level, unspecified arm Non-Billable/Non-Specific Codes S56.519A..., initial encounterS56.519D..., subsequent encounterS56.519S..., sequela