ICD-10 Code G90.09 – Other idiopathic peripheral autonomic neuropathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G90.09 – Other idiopathic peripheral autonomic neuropathy
What it is
G90.09 identifies a peripheral autonomic neuropathy with no known cause that affects the autonomic nerves outside the brain and spinal cord. Use it when documentation states idiopathic autonomic nerve dysfunction and no more specific subtype is named.
Clinical signs
Clinical features vary; refer to documentation. Common autonomic findings may include abnormal sweating, blood pressure changes, gastrointestinal motility problems, or urinary symptoms when the autonomic nerves are involved.
When to use this code
Use this code when the provider documents idiopathic peripheral autonomic neuropathy, autonomic neuropathy of unknown cause, or similar wording. It fits cases where the neuropathy is peripheral and no underlying disorder has been identified.
Code it only when the record supports autonomic nerve involvement rather than a purely sensory or motor neuropathy. If the cause is documented, or another autonomic neuropathy code is more specific, choose the documented diagnosis instead.
Do not use for
Do not use G90.09 for autonomic neuropathy with a known cause, such as diabetes or another systemic condition. Check documentation if the record describes generalized neuropathy without clear autonomic involvement.
Coding tip
Query for the cause and the specific autonomic manifestations when the note says only “neuropathy,” because idiopathic coding requires both unknown etiology and peripheral autonomic involvement.