ICD-10 Code L55.0 – Sunburn of first degree (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L55.0 – Sunburn of first degree
What it is
L55.0 identifies a first-degree sunburn, meaning superficial skin injury from ultraviolet exposure. It reflects redness and irritation limited to the outer skin layer, without blistering.
Clinical signs
Typical findings include erythema, warmth, tenderness, and mild swelling after sun exposure. Clinical features vary; refer to documentation if the record does not clearly describe the burn depth.
When to use this code
Use L55.0 when the provider documents a first-degree sunburn or superficial burn from sunlight. It fits cases described as mild sunburn, skin redness, or painful tanning injury without blistering. If the depth is unclear, check documentation before coding.
Do not use for
Do not use this code for second-degree or deeper sunburn, which involves blistering or more severe tissue injury. Also avoid it when the record only states “burn” without confirming sun exposure.
Coding tip
Code the burn depth exactly as documented, and query the provider if the note does not clearly identify first-degree sunburn.