ICD-10 G37.8
Non-Billable HeaderOther specified demyelinating diseases of central nervous system
About ICD-10-CM G37.8
ICD-10-CM code G37.8 represents Other specified demyelinating diseases of central nervous system. This is a non-billable header code in the Nervous System chapter (block G37). The 2026 edition of ICD-10-CM G37.8 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.
Medicare LCD Coverage for G37.8
Local Coverage Determinations (LCDs) from CMS MACs that list G37.8 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 G37.8.
1 Cigna
1 NY Medicaid
CPT Codes Commonly Billed with G37.8
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.
Convert G37.8 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| G37.8 | 3418 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G37.8
Other codes in section G35-G37 (Demyelinating diseases of the central nervous system).
ICD-10 G37.8, Billing FAQ
Is ICD-10 code G37.8 billable? +
No, G37.8 is a non-billable header code. Use a more specific child code from block G37 when submitting claims.
What ICD-9 codes does G37.8 map to? +
Per CMS GEMs, G37.8 maps to ICD-9 codes: 3418. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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