S56.309 - Unspecified 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 S56.30 - Unspecified injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level S56.309 - Unspecified injury of extensor or abductor muscles, fascia and tendons of unspecified thumb at forearm level