ICD-10 Code L27 – Dermatitis due to substances taken internally (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L27 – Dermatitis due to substances taken internally
What it is
L27 identifies dermatitis caused by a substance taken internally, such as a medication, food, or other ingested agent. It is used when the skin reaction is attributed to internal exposure rather than direct contact.
Clinical signs
Typical findings include a rash, erythema, itching, or other inflammatory skin changes after internal exposure. Clinical features vary; refer to documentation for the specific reaction pattern and suspected trigger.
When to use this code
Use L27 when the record links dermatitis to a substance taken by mouth or otherwise absorbed internally and the clinician documents that relationship. This code fits cases where the skin reaction is the primary documented issue. Check documentation if the exact agent or reaction type is unclear.
Do not use for
Do not use this code for dermatitis caused by direct skin contact with an external substance. Also avoid it when the chart documents a different diagnosis or when the internal cause is not supported.
Coding tip
Assign the code only when the provider clearly documents an internal substance as the cause of the dermatitis.