M84.43Pathological fracture, ulna and radius

M84.43 is the ICD-10-CM diagnosis code for pathological fracture, ulna and radius. It belongs to category M84 (disorder of continuity of bone), block M80-M85 (disorders of bone density and structure) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

Within M84.4 (pathological fracture, not elsewhere classified), M84.43 is specifically for pathological fracture, ulna and radius. Related codes cover unspecified site (M84.40), shoulder (M84.41), humerus (M84.42), hand and fingers (M84.44), femur and pelvis (M84.45), tibia and fibula (M84.46), ankle, foot and toes (M84.47) and other site (M84.48).

Codes in this range require a 7th character: A for initial encounter for 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 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.