G44.329 ICD-10-CM Code: Chronic post-traumatic headache, not intractable
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FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Episodic and paroxysmal disorders (G40-G47)
G44.329
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceChronic post-traumatic headache, not intractable
This is a long-lasting headache that develops after a head injury or trauma and does not resist treatment with standard pain management approaches. The headache persists beyond the typical recovery period following the initial injury.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Chronic post-traumatic headache NOS
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for G44.329 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for G44.329 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for G44.329 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for G44.329 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for G44.329 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for G44.329 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is G44.329 an HCC code?
No. G44.329 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
G44.329 is the ICD-10-CM diagnosis code for chronic post-traumatic headache, not intractable. This is a long-lasting headache that develops after a head injury or trauma and does not resist treatment with standard pain management approaches. The headache persists beyond the typical recovery period following the initial injury. G44.329 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering episodic and paroxysmal disorders (g40-g47).
G44.329 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Verify that the headache began after a documented head injury or traumatic event; post-traumatic headaches must have a clear temporal relationship to the trauma.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for G44.329 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify that the headache began after a documented head injury or traumatic event; post-traumatic headaches must have a clear temporal relationship to the trauma
- •Confirm the headache is 'not intractable' (meaning it responds to treatment) before assigning this code; if the patient has intractable/refractory headaches, use G44.321 instead