ICD-10 Code G99.0 – Autonomic neuropathy in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G99.0 – Autonomic neuropathy in diseases classified elsewhere
What it is
This code identifies autonomic nerve damage caused by another underlying disease. It is used when the autonomic nervous system is affected, but the primary condition remains the main diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include abnormal blood pressure control, heart rate changes, sweating abnormalities, or gastrointestinal and bladder dysfunction linked to the underlying disorder.
When to use this code
Use G99.0 when the record clearly states autonomic neuropathy and links it to another disease, such as diabetes or a neurologic condition. Code the underlying disease first when it is the reason for the neuropathy. Use the note in the chart, not assumptions, to confirm the relationship.
Do not use for
Do not use this code for autonomic symptoms without documented neuropathy. Also avoid it when the autonomic disorder is not stated as due to another disease; check documentation.
Coding tip
Verify that the provider documents both the autonomic neuropathy and the causative condition before assigning G99.0.