D04.2Carcinoma in situ of skin of ear and external auricular canal

D04.2 is the ICD-10-CM diagnosis code for carcinoma in situ of skin of ear and external auricular canal. It belongs to category D04 (carcinoma in situ of skin), block D00-D09 (in situ neoplasms) 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 D04 (carcinoma in situ of skin), D04.2 is specifically for carcinoma in situ of skin of ear and external auricular canal. Related codes cover of lip (D04.0), of eyelid, including canthus (D04.1), of other and unspecified parts of face (D04.3), of scalp and neck (D04.4), of trunk (D04.5), of upper limb, including shoulder (D04.6), of lower limb, including hip (D04.7), of other sites (D04.8) and 1 more.

To report this condition, pick the subcode that matches the documentation: D04.20 (canal), D04.21 (canal) and D04.22 (canal).

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