ICD-10 G44.009
Billable / SpecificCluster headache syndrome, unspecified, not intractable
About ICD-10-CM G44.009
ICD-10-CM code G44.009 represents Cluster headache syndrome, unspecified, not intractable. This is a billable/specific code in the Nervous System chapter (block G44). The 2026 edition of ICD-10-CM G44.009 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under G44.009. Per CMS ICD-10-CM Tabular 2026.
- Cluster headache syndrome NOS
Medicare LCD Coverage for G44.009
Local Coverage Determinations (LCDs) from CMS MACs that list G44.009 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 G44.009.
1 Cigna
2 Medicare
CPT Codes Commonly Billed with G44.009
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 G44.009 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 |
|---|---|---|
| G44.009 | 33900 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G44.009
Other codes in section G40-G47 (Episodic and paroxysmal disorders).
ICD-10 G44.009, Billing FAQ
Is ICD-10 code G44.009 billable? +
Yes, G44.009 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to G44.009? +
ICD-10 G44.009 includes: Cluster headache syndrome NOS.
What ICD-9 codes does G44.009 map to? +
Per CMS GEMs, G44.009 maps to ICD-9 codes: 33900. Useful for legacy data review and historical claim analysis.
Get the full PayerReady toolkit
Free access to CPT/ICD-10 lookup, denial appeals, fee comparator, and claim auditing with credentialing enrollment.
Start free →Run this code through our claim audit tool
Check NCCI bundling, MUE limits, and modifier logic before submission.
Try the auditor →Did this page help?
Quick signal so we know what to improve.
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team