ICD-10 Code L57.9 – Skin changes due to chronic exposure to nonionizing radiation, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L57.9 – Skin changes due to chronic exposure to nonionizing radiation, unspecified
What it is
This code identifies skin changes caused by long-term exposure to nonionizing radiation, without a more specific diagnosis documented. Use it when the record notes radiation-related skin damage but does not name a particular type.
Clinical signs
Findings may include chronic skin discoloration, thickening, or other visible changes linked to repeated exposure. Clinical features vary; refer to documentation.
When to use this code
Use L57.9 when the clinician documents skin changes from chronic nonionizing radiation exposure and does not specify a more precise condition. It also fits when the note clearly links the skin findings to that exposure but leaves the subtype unspecified. Check documentation if the cause is unclear.
Do not use for
Do not use this code for acute burns, sunburn, or other skin injuries without documented chronic nonionizing radiation exposure. If a more specific radiation-related skin disorder is documented, code that condition instead.
Coding tip
Assign the unspecified code only after confirming the provider documented chronic nonionizing radiation exposure and no more specific skin diagnosis.