S55.9Injury of unspecified blood vessel at forearm level

S55.9 is the ICD-10-CM diagnosis code for injury of unspecified blood vessel at forearm level. It belongs to category S55 (injury of blood vessels 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 S55, choose S55.9 (unspecified blood vessel at forearm level) only when documentation doesn't support a more specific option: ulnar artery at forearm level (S55.0), radial artery at forearm level (S55.1), vein at forearm level (S55.2) and other blood vessels at forearm level (S55.8).

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.