ICD-10 G44.001
Billable / SpecificCluster headache syndrome, unspecified, intractable
About ICD-10-CM G44.001
ICD-10-CM code G44.001 represents Cluster headache syndrome, unspecified, intractable. This is a billable/specific code in the Nervous System chapter (block G44). The 2026 edition of ICD-10-CM G44.001 became effective on October 1, 2025.
Medicare LCD Coverage for G44.001
Local Coverage Determinations (LCDs) from CMS MACs that list G44.001 as a covered diagnosis.
Showing top 10 of 40 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G44.001.
3 Aetna
2 Cigna
2 Medicare
CPT Codes Commonly Billed with G44.001
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 G44.001 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 |
|---|---|---|
| G44.001 | 33900 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G44.001
Other codes in section G40-G47 (Episodic and paroxysmal disorders).
ICD-10 G44.001, Billing FAQ
Is ICD-10 code G44.001 billable? +
Yes, G44.001 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What ICD-9 codes does G44.001 map to? +
Per CMS GEMs, G44.001 maps to ICD-9 codes: 33900. 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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