ICD-10 Code L74.0 – Miliaria rubra (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L74.0 – Miliaria rubra
What it is
Miliaria rubra is a heat-related skin eruption caused by blocked sweat ducts. It usually appears as an itchy, red rash in areas where sweating is heavy.
Clinical signs
Typical findings include small red papules or papulovesicles with itching or prickling. Clinical features vary; refer to documentation if the note does not clearly describe miliaria rubra.
When to use this code
Use L74.0 when the record specifically documents miliaria rubra, prickly heat, or heat rash with an inflamed red eruption. You may also use it when the provider identifies sweat-duct obstruction as the cause. If the note is nonspecific, check documentation.
Do not use for
Do not use this code for other rashes, eczema, or infectious skin conditions. If the diagnosis is only “rash” or “dermatitis” without miliaria rubra, choose the documented condition instead.
Coding tip
Code only when the provider clearly links the eruption to miliaria rubra; otherwise, query or check documentation.