ICD-10 Code G13.0 – Paraneoplastic Neuromyopathy and Neuropathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G13.0 – Paraneoplastic neuromyopathy and neuropathy
What it is
This code identifies nerve and muscle problems caused by a cancer-related immune response, rather than by direct tumor spread. Use it when documentation links the neuromyopathy or neuropathy to a paraneoplastic syndrome.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include progressive weakness, sensory changes, or mixed neuromuscular symptoms associated with an underlying malignancy.
When to use this code
Use G13.0 when the provider documents paraneoplastic neuromyopathy, paraneoplastic neuropathy, or a paraneoplastic neuromuscular syndrome affecting both nerves and muscle. It is appropriate when the neurologic disorder is attributed to cancer and not explained by another cause. Check documentation if the record only says “neuropathy” without a paraneoplastic link.
Do not use for
Do not use this code for neuropathy caused by diabetes, chemotherapy, compression, or other non-paraneoplastic causes. If the chart does not clearly connect the condition to a paraneoplastic process, check documentation.
Coding tip
Assign the underlying malignancy separately when documented, and code G13.0 only when the paraneoplastic relationship is stated.