ICD-10 Code L74.51 – Primary focal hyperhidrosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L74.51 – Primary focal hyperhidrosis
What it is
L74.51 identifies primary focal hyperhidrosis, a condition marked by excessive sweating in specific areas such as the palms, soles, underarms, or face. It is not due to another disease or medication.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include recurrent, visible sweating that is focal, often bilateral, and out of proportion to heat or activity.
When to use this code
Use L74.51 when the record documents primary focal hyperhidrosis without an identified secondary cause. It applies when the provider describes localized excessive sweating as the diagnosis. If the note suggests infection, endocrine disease, medication effect, or another underlying disorder, check documentation before assigning this code.
Do not use for
Do not use this code for generalized sweating or hyperhidrosis clearly caused by another condition. Do not use it when the chart only says “sweating” without confirming primary focal hyperhidrosis.
Coding tip
Confirm that the provider documents both the focal pattern and the primary, nonsecondary nature of the condition before coding L74.51.