ICD-10 Code L74.4 – Anhidrosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L74.4 – Anhidrosis
What it is
Anhidrosis means reduced or absent sweating. Use this code when documentation shows the patient cannot sweat normally, which can affect temperature regulation.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include dry skin, heat intolerance, and little or no sweating despite heat or exertion.
When to use this code
Use L74.4 when the record clearly states anhidrosis or absence of sweating as the diagnosis. It may also fit documented hypohidrosis when the clinician uses that term to describe markedly decreased sweating. Confirm the condition is not being described only as a symptom of another disorder.
Do not use for
Do not use this code for ordinary dehydration, fever, or medication side effects unless the provider diagnoses anhidrosis. If the note only says “dry skin” or “heat rash,” check documentation.
Coding tip
Code the documented sweating disorder, and query if the chart mentions heat intolerance without a clear diagnosis.