G13: Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere

Codes under G13 (Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
G13.0	Paraneoplastic neuromyopathy and neuropathy	✓
G13.1	Other systemic atrophy primarily affecting central nervous system in neoplastic disease	✓
G13.2	Systemic atrophy primarily affecting the central nervous system in myxedema	✓
G13.8	Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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