S42.4Fracture of lower end of humerus

S42.4 is the ICD-10-CM diagnosis code for fracture of lower end of humerus. It belongs to category S42 (fracture of shoulder and upper arm), block S40-S49 (injuries to the shoulder and upper arm) 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 10 subcodes must be used instead.

Within S42 (fracture of shoulder and upper arm), S42.4 is specifically for fracture of lower end of humerus. Related codes cover clavicle (S42.0), scapula (S42.1), upper end of humerus (S42.2), shaft of humerus (S42.3) and shoulder girdle, part unspecified (S42.9).

Codes in this range require a 7th character: A for initial encounter for closed fracture, B for initial encounter for open fracture, D for subsequent encounter for fracture with routine healing, G for subsequent encounter for fracture with delayed healing, K for subsequent encounter for fracture with nonunion, P for subsequent encounter for fracture with malunion and 1 more. Use placeholder "X" characters to fill any empty positions before the 7th character.

The conditions in its Excludes2 note aren't part of S42.4, but may be coded alongside it if the patient has both: fracture of shaft of humerus (S42.3-) and physeal fracture of lower end of humerus (S49.1-).

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