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  5. Dermatitis due to substances taken internally (L27)

Dermatitis due to substances taken internally (L27)

ICD-10 code L27 covers various types of dermatitis caused by substances taken internally, including drugs, food, or other ingested chemicals. These codes help specify the skin reaction’s cause and extent, aiding accurate diagnosis and treatment.

The section includes L27.0 for generalized skin eruptions from drugs and medicaments taken internally, also known as drug exanthem or maculopapular drug eruption. This helps identify widespread allergic reactions to medications like ampicillin or fluoroquinolones. L27.1 describes localized skin eruptions such as fixed drug reactions or acneiform eruptions from specific drugs. When the dermatitis results specifically from ingested food, L27.2 applies. L27.8 captures dermatitis caused by other internal substances, including halogen eruptions and bromoderma. When the exact internal cause is unknown, L27.9 is used to code unspecified dermatitis due to internal substances, sometimes referred to as baboon syndrome or intertrigo. These detailed codes guide medical coders in selecting the right ICD-10 code for skin conditions caused by internal agents, improving clarity in patient records and billing.

Instructional Notations

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

Type 2 Excludes

A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

  • adverse food reaction, except dermatitis T78.0 T78.1
  • contact dermatitis L23 L25
  • drug photoallergic response L56.1
  • drug phototoxic response L56.0
  • urticaria L50

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Intertrigo

A superficial dermatitis occurring on skin surfaces in contact with each other, such as the axillae, neck creases, intergluteal fold, between the toes, etc. Obesity is a predisposing factor. The condition is caused by moisture and friction and is characterized by erythema, maceration, burning, and exudation.