2025 ICD-10-CM code I66
(Valid) Effective Date: N/A Diseases of the circulatory system - Cerebrovascular diseases 9 Feed
Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction. This includes embolism, narrowing, obstruction (complete or partial), and thrombosis of cerebral arteries.
Medical necessity is established by the presence of signs, symptoms, or diagnostic findings indicative of cerebrovascular disease.The specific criteria may vary depending on the payer and the clinical circumstances.
Diagnosis and management of cerebrovascular diseases fall under neurology, interventional radiology, and potentially other specialties depending on the specific treatment approach (e.g., vascular surgery).
In simple words: Narrowing or blockage of the arteries in the brain, but without causing a stroke.
Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction. Includes: embolism of cerebral artery, narrowing of cerebral artery, obstruction (complete) (partial) of cerebral artery, thrombosis of cerebral artery. Excludes1: Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)
Example 1: A patient presents with transient symptoms like weakness on one side, difficulty speaking, or vision changes, which resolve completely. Diagnostic imaging reveals a narrowed cerebral artery, but no evidence of infarction., A patient with known atherosclerosis undergoes imaging as part of a routine checkup. The imaging identifies a partially blocked artery in the brain, but the patient has no related symptoms., A patient experiences a transient ischemic attack (TIA), which is a temporary blockage of blood flow to the brain. Imaging shows a stenosis in a cerebral artery, but it is not severe enough to cause permanent damage.
Documentation should include details of the patient's symptoms, neurological examination findings, results of imaging studies (e.g., CT, MRI, angiography), and any other relevant medical history.
** Excludes1: Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)
- Specialties:Neurology, Interventional Radiology, Vascular Surgery
- Place of Service:Inpatient Hospital, On Campus-Outpatient Hospital, Off Campus-Outpatient Hospital, Office, Independent Clinic