S56.399 - Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level S56.3 - Injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level S56.39 - Other injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level S56.399 - Other injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level