ICD-10 Code L59 – Other disorders of skin and subcutaneous tissue related to radiation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L59 – Other disorders of skin and subcutaneous tissue related to radiation
What it is
L59 covers skin and subcutaneous tissue disorders caused by radiation exposure when the condition is not classified elsewhere. Use it for radiation-related tissue changes documented by the clinician.
Clinical signs
Findings may include skin redness, dryness, ulceration, fibrosis, or other localized tissue changes after radiation therapy or exposure. Clinical features vary; refer to documentation.
When to use this code
Use L59 when the record links the skin or subcutaneous disorder to prior radiation and no more specific code applies. It may fit delayed or persistent radiation effects documented by the provider. Check documentation for the exact site and type of tissue injury.
Do not use for
Do not use this code for acute burns, dermatitis from non-radiation causes, or unspecified skin disorders without a radiation link. If another diagnosis is documented, code that condition instead.
Coding tip
Confirm that the provider explicitly documents radiation as the cause before assigning L59.