ICD-10 G31
Non-Billable HeaderOther degenerative diseases of nervous system, not elsewhere classified
About ICD-10-CM G31
ICD-10-CM code G31 represents Other degenerative diseases of nervous system, not elsewhere classified. This is a non-billable header code in the Nervous System chapter (block G31). The 2026 edition of ICD-10-CM G31 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Type 2 Excludes
Not included here, the excluded code is not part of G31, but a patient may have both conditions at the same time. Both codes may be coded together when applicable.
- Reye's syndrome (G93.7)
Use Additional Code
When coding G31, also report these additional codes when applicable.
- code, if applicable, for codes G31.0-G31.83, G31.85-G31.9, to identify:
- dementia with anxiety (F02.84, F02.A4, F02.B4, F02.C4)
- dementia with behavioral disturbance (F02.81-, F02.A1-, F02.B1-, F02.C1-)
- dementia with mood disturbance (F02.83, F02.A3, F02.B3, F02.C3)
- dementia with psychotic disturbance (F02.82, F02.A2, F02.B2, F02.C2)
- dementia without behavioral disturbance (F02.80, F02.A0, F02.B0, F02.C0)
- mild neurocognitive disorder due to known physiological condition (F06.7-)
Medicare LCD Coverage for G31
Local Coverage Determinations (LCDs) from CMS MACs that list G31 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G31.
1 Humana
CPT Codes Commonly Billed with G31
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To G31
Other codes in section G30-G32 (Other degenerative diseases of the nervous system).
ICD-10 G31, Billing FAQ
Is ICD-10 code G31 billable? +
No, G31 is a non-billable header code. Use a more specific child code from block G31 when submitting claims.
What codes are Type 2 Excludes for G31? +
Type 2 Excludes (may be coded together when both conditions exist): Reye's syndrome (G93.7)
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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