ICD-10 Code L30.4 – Erythema intertrigo (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L30.4 – Erythema intertrigo
What it is
L30.4 identifies erythema intertrigo, an inflammatory skin condition in body folds. It usually reflects irritation from moisture, friction, and skin-on-skin contact.
Clinical signs
Typical findings include red, macerated, and sometimes tender rash in warm skin folds such as the groin, under the breasts, or between the buttocks. Clinical features vary; refer to documentation.
When to use this code
Use L30.4 when the provider documents intertrigo or erythema intertrigo as the diagnosis. It fits cases where the note describes an inflammatory fold rash without a more specific alternative diagnosis. If another condition, such as infection or dermatitis, is documented as the primary problem, code that instead.
Do not use for
Do not use L30.4 for simple skin redness without intertrigo, or when the documentation names a different dermatitis type. Check documentation if the rash is actually candidiasis, psoriasis, or another specific disorder.
Coding tip
Confirm the site and exact wording in the note, because “rash in folds” alone may not support L30.4.