T33.4Superficial frostbite of arm

T33.4 is the ICD-10-CM diagnosis code for superficial frostbite of arm. It belongs to category T33 (superficial frostbite), block T33-T34 (frostbite) 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 T33 (superficial frostbite), T33.4 is specifically for superficial frostbite of arm. Related codes cover of head (T33.0), of neck (T33.1), of thorax (T33.2), of abdominal wall, lower back and pelvis (T33.3), of wrist, hand, and fingers (T33.5), of hip and thigh (T33.6), of knee and lower leg (T33.7), of ankle, foot, and toe(s) (T33.8) and 1 more.

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.

The conditions in its Excludes2 note aren't part of T33.4, but may be coded alongside it if the patient has both: superficial frostbite of wrist and hand (T33.5-).

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