ICD-10 Code L74.510 – Primary focal hyperhidrosis, axilla (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L74.510 – Primary focal hyperhidrosis, axilla
What it is
This code identifies primary focal hyperhidrosis limited to the axillae. It means excessive underarm sweating without an identified secondary cause such as medication, infection, or endocrine disease.
Clinical signs
Patients typically report recurrent, visible underarm sweating that is out of proportion to heat or activity. Clinical features vary; refer to documentation for laterality, chronicity, and impact on daily function.
When to use this code
Use L74.510 when the provider documents primary focal hyperhidrosis affecting the axillae and no secondary cause is stated. It is appropriate for office visits, dermatology evaluations, and problem-list coding when the condition is confirmed. If the note only says “excessive sweating” or does not specify the site, check documentation.
Do not use for
Do not use this code for generalized sweating or hyperhidrosis due to another condition, medication, or systemic illness. Do not assign it when the axillary location is not documented.
Coding tip
Confirm both the focal axillary site and the primary nature of the disorder before assigning L74.510.