ICD-10-CM > S00-T88 > S50-S59 > S56 > S56.3 > S56.31 > S56.311 S56.311 Strain of extensor or abductor muscles, fascia and tendons of right thumb at forearm level Non-Billable/Non-Specific Codes S56.311A..., initial encounterS56.311D..., subsequent encounterS56.311S..., sequela