Miliaria crystallina
ICD-10 L74.1 is a billable code used to indicate a diagnosis of miliaria crystallina.
Miliaria crystallina, commonly known as heat rash or sweat rash, is a benign dermatological condition characterized by the obstruction of sweat ducts, leading to the accumulation of sweat beneath the skin. Clinically, it presents as small, clear, fluid-filled vesicles that appear on the skin, particularly in areas prone to sweating such as the trunk, neck, and axillae. The condition is most prevalent in hot, humid environments and is often seen in infants, although it can affect individuals of any age. The underlying anatomy involved includes the eccrine sweat glands and the stratum corneum of the epidermis. Disease progression is typically rapid, with lesions appearing within hours of exposure to heat or humidity. Miliaria crystallina is self-limiting, and symptoms usually resolve once the individual is moved to a cooler environment. Diagnostic considerations include a thorough clinical examination and a review of the patient's history, particularly regarding recent heat exposure or excessive sweating. Differential diagnoses may include other vesicular skin conditions, such as herpes simplex or varicella, which can be ruled out based on clinical presentation and history.
Standard ICD-10-CM documentation requirements apply
Various clinical presentations within this specialty area
Follow specialty-specific billing guidelines
Standard ICD-10-CM documentation requirements apply
Various clinical presentations within this specialty area
Follow specialty-specific billing guidelines
L74.1 specifically covers miliaria crystallina, characterized by clear vesicles due to sweat duct obstruction. It does not include other forms of miliaria such as miliaria rubra or miliaria profunda.
L74.1 should be used when the clinical presentation is consistent with miliaria crystallina, particularly when clear vesicles are observed. It should not be used for miliaria rubra, which presents with erythematous papules.
Documentation should include a clinical description of the vesicular rash, patient history of heat exposure, and any relevant physical examination findings. Photographic evidence may also support the diagnosis.
