S56.409Unspecified injury of extensor muscle, fascia and tendon of unspecified finger at forearm level

S56.409 is the ICD-10-CM diagnosis code for unspecified injury of extensor muscle, fascia and tendon of unspecified finger 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 S56.40, choose S56.409 (unspecified finger at forearm level) only when documentation doesn't support a more specific option: right index finger at forearm level (S56.401), left index finger at forearm level (S56.402), right middle finger at forearm level (S56.403), left middle finger at forearm level (S56.404), right ring finger at forearm level (S56.405), left ring finger at forearm level (S56.406), right little finger at forearm level (S56.407) and left little finger at forearm level (S56.408).

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.