S56.31Strain of extensor or abductor muscles, fascia and tendons of thumb at forearm level

S56.31 is the ICD-10-CM diagnosis code for strain of extensor or abductor muscles, fascia and tendons of thumb at forearm level. It belongs to category S56 (injury of muscle, fascia and tendon at forearm level), block S50-S59 (injuries to the elbow and forearm) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within S56.3 (injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level), S56.31 is specifically for strain of extensor or abductor muscles, fascia and tendons of thumb at forearm level. Related codes cover unspecified injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level (S56.30), laceration of extensor or abductor muscles, fascia and tendons of thumb at forearm level (S56.32) and other injury of extensor or abductor muscles, fascia and tendons of thumb at forearm level (S56.39).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.