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 | ✓ |
| G13.0 | Paraneoplastic neuromyopathy and neuropathy | ✓ |
| G13.1 | Other systemic atrophy primarily affecting central nervous system in neoplastic disease | ✓ |
| 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 | ✓ |
| G13.2 | Systemic atrophy primarily affecting the central nervous system in myxedema | ✓ |
| G13.8 | Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere | ✓ |
| G13.8 | Systemic atrophy primarily affecting central nervous system in other diseases classified elsewhere | ✓ |
Frequently asked questions
What is ICD-10-CM code G13?
G13 is an ICD-10-CM category covering Systemic atrophies primarily affecting central nervous system in diseases classified elsewhere. It contains 8 more specific diagnosis codes, 8 of which are billable.
Is G13 a billable code?
No — G13 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example G13.0 — Paraneoplastic neuromyopathy and neuropathy). 8 of the 8 codes under G13 are billable.
What codes fall under G13?
G13 includes G13.0, G13.0, G13.1, G13.1, G13.2, plus 3 more. See the full list with descriptions and billable status above.
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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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