In simple words: This code describes a skin rash or irritation caused by something you swallowed or absorbed through your skin.It's a reaction to medicines, vitamins, or other substances you took internally.

This code classifies dermatitis (inflammation of the skin) caused by substances ingested or absorbed into the body.It encompasses skin reactions resulting from the internal use of medications, supplements, or other substances.This excludes allergic reactions not specifically related to dermatitis, adverse food reactions (excluding dermatitis), contact dermatitis, drug-induced photosensitivity reactions (photoallergic and phototoxic), and urticaria.

Example 1: A patient presents with a widespread rash after starting a new antibiotic. The physician suspects drug-induced dermatitis and orders allergy testing., A patient develops itchy, red patches on their skin after consuming large quantities of a particular food. The physician determines the rash is due to an internal substance and codes it as L27., A patient with a history of eczema experiences a flare-up after starting a new dietary supplement. The physician documents the flare-up as a dermatitis due to internal substances.

Detailed patient history focusing on recent medication use, dietary changes, and supplement intake.Physical examination findings describing the rash's location, morphology, and distribution. Results of allergy testing or other relevant investigations (if performed).

** Always confirm the causative agent if possible. Consider using additional codes to specify the type of dermatitis, location, and severity.