ICD-10 Code L55.1 – Sunburn of second degree (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L55.1 – Sunburn of second degree
What it is
Second-degree sunburn is a more severe ultraviolet skin injury that affects the epidermis and upper dermis. It usually causes painful redness with blistering after sun exposure.
Clinical signs
Typical findings include erythema, tenderness, swelling, and blister formation. Clinical features vary; refer to documentation.
When to use this code
Use L55.1 when the record clearly documents second-degree sunburn or sunburn with blistering. You may also use it when the clinician specifies a partial-thickness solar burn after exposure. Check documentation if the depth or degree is not stated.
Do not use for
Do not use this code for first-degree sunburn, simple skin redness, or other burns from heat or chemicals. If the note does not identify second-degree injury, check documentation.
Coding tip
Code the documented degree exactly; if the record only says “sunburn,” do not assume second degree.