ICD-10 Code G13.1 – Other systemic atrophy primarily affecting central nervous system in neoplastic disease (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G13.1 – Other systemic atrophy primarily affecting central nervous system in neoplastic disease
What it is
This code identifies a neurologic degenerative syndrome affecting the central nervous system and occurring in the setting of neoplastic disease. Use it when documentation links systemic atrophy to an underlying cancer-related condition.
Clinical signs
Clinical features vary; refer to documentation. Standard references describe progressive neurologic dysfunction, often with gait disturbance, coordination problems, or other signs of central nervous system involvement.
When to use this code
Use G13.1 when the provider documents other systemic atrophy primarily affecting the central nervous system and ties it to neoplastic disease. It may apply when the neurologic disorder is secondary to a malignancy or cancer-associated process. If the record does not clearly connect the condition to neoplastic disease, check documentation.
Do not use for
Do not use this code for systemic atrophy unrelated to neoplastic disease or for unspecified neurologic decline. Also avoid it when the chart describes a different degenerative disorder with a more specific code.
Coding tip
Verify both the neurologic diagnosis and the neoplastic disease linkage in the provider note before assigning G13.1.