ICD-10 Code E26.01 – Conn’s syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E26.01 – Conn’s syndrome
What it is
Conn’s syndrome is primary hyperaldosteronism caused by excess aldosterone production from the adrenal glands. Use this code when documentation identifies this specific diagnosis.
Clinical signs
Common findings include hypertension, low potassium, muscle weakness, and sometimes fatigue or headaches. Clinical features vary; refer to documentation.
When to use this code
Use E26.01 when the record states Conn’s syndrome, primary aldosteronism, or aldosterone-producing adrenal disease. It also fits cases confirmed by specialist evaluation or imaging when the clinician documents this diagnosis. If the chart only says hyperaldosteronism without specifying primary disease, check documentation.
Do not use for
Do not use this code for secondary hyperaldosteronism or other adrenal disorders that are not Conn’s syndrome. If the cause is unclear, check documentation before assigning E26.01.
Coding tip
Match the code to the provider’s exact wording; primary versus secondary hyperaldosteronism changes code selection.