Subarachnoid haemorrhage not known if aneurysmal or non-aneurysmal
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In short
A subarachnoid haemorrhage is a type of hemorrhagic stroke where bleeding occurs in the space between the brain and the thin layers of tissues covering it. This bleeding often happens when a weak spot in an artery, known as an aneurysm, bursts on the surface of the brain. Symptoms of a hemorrhagic stroke often happen suddenly and can include sudden numbness or weakness, sudden confusion, trouble speaking, trouble seeing, trouble walking, or a sudden severe headache with no known cause. Treatment must be administered as quickly as possible to find and stop the cause of bleeding, which may involve medicines or surgery to stop the bleeding or relieve pressure on the brain.
Source: MedlinePlus, National Library of Medicine.
AI-generated summary of the sources cited on this page, checked automatically against them. Not reviewed by a clinician; not medical advice.
Codes
Description
What is a hemorrhagic stroke?
A stroke happens when there is a loss of blood flow to part of the brain. Your brain cells cannot get the oxygen and nutrients they need from blood, and they start to die within a few minutes. This can cause lasting brain damage, long-term disability, or even death.
There are two main types of strokes, ischemic and hemorrhagic. A hemorrhagic stroke is less common but often more severe. It occurs when a blood vessel in the brain bursts, causing bleeding (hemorrhage) in or around the brain. This bleeding increases pressure inside the skull and damages brain tissue. Within minutes, brain cells begin to die.
What are the types of hemorrhagic stroke?
Hemorrhagic strokes are classified by where the bleeding happens:
- Intracerebral hemorrhage. Bleeding occurs directly into the brain tissue. This is the most common type of hemorrhagic stroke.
- Subarachnoid hemorrhage. Bleeding occurs in the space between the brain and the thin layers of tissues covering it. This often happens when a weak spot in an artery (called an aneurysm) bursts on the brain's surface.
What causes hemorrhagic stroke?
Common causes include:
- Aneurysm. A bulge or "ballooning" in a weakened artery wall that can burst.
- Arteriovenous malformation (AVM). A tangled group of abnormal blood vessels that can rupture inside the brain.
- High blood pressure (hypertension). Over time, it can weaken blood vessel walls and increase the risk of them breaking open.
- Head trauma. Brain injury can cause bleeding.
What are the symptoms of a hemorrhagic stroke?
Stroke symptoms often happen suddenly. They include:
- Sudden numbness or weakness of the face, arm or leg (especially on one side of the body)
- Sudden confusion, trouble speaking, or understanding speech
- Sudden trouble seeing in one or both eyes
- Sudden trouble walking, dizziness, loss of balance or coordination
- Sudden severe headache with no known cause
The F.A.S.T. test can help you remember what to look for if you think someone is having a
stroke. Think "FAST" and look for:
- Face drooping on one side when smiling.
- Arm weakness occurs when the arms are raised, and one arm drifts downward.
- Speech is slurred or strange.
- Time to call 911.
How is a hemorrhagic stroke diagnosed?
To make a diagnosis, your health care provider may do a physical exam, ask about your symptoms and medical history, and use imaging tests to check for bleeding in your brain.
How is hemorrhagic stroke treated?
It is important to treat strokes as quickly as possible. For a hemorrhagic stroke, the first step is to find the cause of bleeding in the brain and stop it. Treatment may involve medicines or, in some cases, surgery to stop the bleeding or relieve pressure on the brain.
After the stroke, rehabilitation can help people recover lost abilities and regain independence.
Can a hemorrhagic stroke be prevented?
The best way to prevent stroke is by making heart-healthy lifestyle changes to lower your risk. If lifestyle changes aren't enough, your provider may prescribe medicine to help manage your risk factors.
NIH: National Institute of Neurological Disorders and Stroke
Next to it in ICD-10
- I39Endocarditis and heart valve disorders in other diseases
- I46Sudden Cardiac Arrest
- I50Heart Failure
- I61Brain haemorrhage (intracerebral)
- I62Other bleeding inside the skull (not due to injury)
- I63Stroke (cerebral infarction)
Neighbouring codes in the classification, not a medical link.
External resources
Questions
What is the ICD-10 code for Subarachnoid haemorrhage not known if aneurysmal or non-aneurysmal?
I60 (WHO, International Classification of Diseases, 10th Revision).
What is the ICD-11 code for Subarachnoid haemorrhage not known if aneurysmal or non-aneurysmal?
8B01.2: Subarachnoid haemorrhage not known if aneurysmal or non-aneurysmal (WHO, ICD-11 for Mortality and Morbidity Statistics).
Sources and attribution
- ICD-11 for Mortality and Morbidity Statistics, © World Health Organization, licensed under CC BY-ND 3.0 IGO.
- Names other than the official source titles: Anpheros translations and plain-language names, made with AI assistance and checked automatically; the source names are in English.
- Source: MedlinePlus, National Library of Medicine.
- ICD-10 codes and titles © World Health Organization. Source: WHO, International Classification of Diseases, 10th Revision (2019).
Anpheros Search catalog 2026.10.5, published 17 October 2026. About the data →
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