ICD-10 Code L54 – Erythema in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L54 – Erythema in diseases classified elsewhere
What it is
L54 identifies erythema, or skin redness, when it is caused by another underlying disease. Use it when the redness is documented as secondary to a condition elsewhere in the record.
Clinical signs
Typical findings include visible redness of the skin that may be localized or more widespread. Clinical features vary; refer to documentation for the underlying cause and any associated rash or inflammation.
When to use this code
Use L54 when the clinician documents erythema as a manifestation of another condition and does not assign a more specific diagnosis. It is appropriate when the record links the redness to an external disease process rather than a primary skin disorder. Check documentation if the cause is unclear.
Do not use for
Do not use L54 for erythema with no documented underlying disease or when a more specific diagnosis explains the finding. Do not substitute it for primary dermatitis, cellulitis, or other clearly identified skin conditions.
Coding tip
Always code the underlying condition first when documented, and use L54 only as the secondary manifestation code.