L23Allergic contact dermatitis

L23 is the ICD-10-CM diagnosis code for allergic contact dermatitis. It belongs to block L20-L30 (dermatitis and eczema) and chapter 12 (diseases of the skin and subcutaneous tissue). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: L23.0 (due to metals), L23.1 (due to adhesives), L23.2 (due to cosmetics), L23.3 (due to drugs in contact with skin), L23.4 (due to dyes), L23.5 (due to other chemical products), L23.6 (due to food in contact with the skin), L23.7 (due to plants, except food) and 2 more.

Don't report L23 together with the conditions in its Excludes1 note: allergy NOS (T78.40), contact dermatitis NOS (L25.9) and dermatitis NOS (L30.9).

The conditions in its Excludes2 note aren't part of L23, but may be coded alongside it if the patient has both: dermatitis due to substances taken internally (L27.-), dermatitis of eyelid (H01.1-), diaper dermatitis (L22), eczema of external ear (H60.5-) and 3 more.

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