C43.5Malignant melanoma of trunk

C43.5 is the ICD-10-CM diagnosis code for malignant melanoma of trunk. It belongs to category C43 (malignant melanoma of skin), block C43-C44 (melanoma and other malignant neoplasms of skin) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within C43 (malignant melanoma of skin), C43.5 is specifically for malignant melanoma of trunk. Related codes cover lip (C43.0), eyelid, including canthus (C43.1), ear and external auricular canal (C43.2), other and unspecified parts of face (C43.3), scalp and neck (C43.4), upper limb, including shoulder (C43.6), lower limb, including hip (C43.7), overlapping sites of skin (C43.8) and 1 more.

To report this condition, pick the subcode that matches the documentation: C43.51 (skin), C43.52 (breast) and C43.59 (trunk).

The conditions in its Excludes2 note aren't part of C43.5, but may be coded alongside it if the patient has both: malignant neoplasm of anus NOS (C21.0) and malignant neoplasm of scrotum (C63.2).

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