ICD-10 Code L74.3 – Miliaria, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L74.3 – Miliaria, unspecified
What it is
L74.3 identifies miliaria, a sweat-duct blockage rash that is not further specified. Use it when the record says miliaria or heat rash without a more precise subtype.
Clinical signs
Clinical features vary; refer to documentation. Miliaria is typically described as small itchy or prickly papules or vesicles in areas exposed to heat, sweating, or occlusion.
When to use this code
Use L74.3 when the clinician documents miliaria, heat rash, or sweat rash and does not name a specific form. It also fits when the note confirms a sweat-related eruption but gives no further detail. If the subtype is stated, code that specific form instead.
Do not use for
Do not use this code for other rashes, eczema, contact dermatitis, or infections unless miliaria is clearly documented. Check documentation if the eruption is described only as nonspecific dermatitis.
Coding tip
When miliaria is mentioned, look for a subtype in the note before assigning the unspecified code.