G44.1 ICD-10-CM Code: Vascular headache, not elsewhere classified
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Episodic and paroxysmal disorders (G40-G47)
G44.1
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceVascular headache, not elsewhere classified
A type of headache caused by blood vessel problems, not fitting into other specific categories. This includes migraines and similar vascular-related headaches.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for G44.1 in this effective period.
Excludes 2
Official- cluster headache (G44.0)
- complicated headache syndromes (G44.5-)
- drug-induced headache (G44.4-)
- migraine (G43.-)
- other specified headache syndromes (G44.8-)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for G44.1 in this effective period.
Excludes 1
Official- headache NOS (R51.9)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for G44.1 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for G44.1 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for G44.1 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 G44.1 an HCC code?
No. G44.1 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- G44.1
- Description
- Vascular headache, not elsewhere classified
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
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
G44.1 is the ICD-10-CM diagnosis code for vascular headache, not elsewhere classified. A type of headache caused by blood vessel problems, not fitting into other specific categories. This includes migraines and similar vascular-related headaches. G44.1 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).
G44.1 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.
Use this code only when the headache is clearly vascular in nature but doesn't meet criteria for migraine or other specified vascular headaches.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for G44.1 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the headache is clearly vascular in nature but doesn't meet criteria for migraine or other specified vascular headaches
- •Review documentation carefully to ensure the headache isn't better classified as migraine (G43) or another specific type