G45.3
BillableAmaurosis fugax
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is G45.3 an HCC code?
No. G45.3 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
G45.3 is the ICD-10-CM diagnosis code for amaurosis fugax. Amaurosis fugax is a temporary loss of vision in one eye that comes and goes, usually lasting only a few minutes to hours. It's often caused by a blood clot or plaque temporarily blocking blood flow to the eye and typically resolves on its own without permanent damage. G45.3 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).
G45.3 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.
Amaurosis fugax is considered a transient ischemic attack (TIA) equivalent and should prompt investigation for stroke risk factors; always check for related codes such as atherosclerosis or carotid artery disease.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for G45.3 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Amaurosis fugax is considered a transient ischemic attack (TIA) equivalent and should prompt investigation for stroke risk factors; always check for related codes such as atherosclerosis or carotid artery disease
- •Document whether this is a first occurrence or recurrent episode, and verify laterality (right eye, left eye, or bilateral) if specified in the clinical documentation for accurate coding