ICD-10-CM Code I66.02

Occlusion and stenosis of left middle cerebral artery

Version 2021 Billable Code

Valid for Submission

I66.02 is a billable code used to specify a medical diagnosis of occlusion and stenosis of left middle cerebral artery. The code is valid for the fiscal year 2021 for the submission of HIPAA-covered transactions. The ICD-10-CM code I66.02 might also be used to specify conditions or terms like cerebral thrombosis, embolism of middle cerebral artery, embolus of left middle cerebral artery, middle cerebral artery occlusion, occlusion of left middle cerebral artery, occlusion of left middle cerebral artery by embolus, etc

ICD-10:I66.02
Short Description:Occlusion and stenosis of left middle cerebral artery
Long Description:Occlusion and stenosis of left middle cerebral artery

Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Cerebral thrombosis
  • Embolism of middle cerebral artery
  • Embolus of left middle cerebral artery
  • Middle cerebral artery occlusion
  • Occlusion of left middle cerebral artery
  • Occlusion of left middle cerebral artery by embolus
  • Thrombosis of left middle cerebral artery
  • Thrombosis of middle cerebral artery

Convert I66.02 to ICD-9

  • 434.00 - Crbl thrmbs wo infrct (Approximate Flag)
  • 434.10 - Crbl emblsm wo infrct (Approximate Flag)
  • 434.90 - Crbl art oc NOS wo infrc (Approximate Flag)

Code Classification

  • Diseases of the circulatory system (I00–I99)
    • Cerebrovascular diseases (I60-I69)
      • Occls and stenosis of cereb art, not rslt in cerebral infrc (I66)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021

Information for Patients


Brain Diseases

The brain is the control center of the body. It controls thoughts, memory, speech, and movement. It regulates the function of many organs. When the brain is healthy, it works quickly and automatically. However, when problems occur, the results can be devastating.

Inflammation in the brain can lead to problems such as vision loss, weakness and paralysis. Loss of brain cells, which happens if you suffer a stroke, can affect your ability to think clearly. Brain tumors can also press on nerves and affect brain function. Some brain diseases are genetic. And we do not know what causes some brain diseases, such as Alzheimer's disease.

The symptoms of brain diseases vary widely depending on the specific problem. In some cases, damage is permanent. In other cases, treatments such as surgery, medicines, or physical therapy can correct the source of the problem or improve symptoms.

  • Basal ganglia dysfunction (Medical Encyclopedia)
  • Brain abscess (Medical Encyclopedia)
  • Brain surgery (Medical Encyclopedia)
  • Central pontine myelinolysis (Medical Encyclopedia)
  • Cerebral spinal fluid (CSF) collection (Medical Encyclopedia)
  • EEG (Medical Encyclopedia)
  • Hepatic encephalopathy (Medical Encyclopedia)
  • Pseudotumor cerebri (Medical Encyclopedia)
  • Wernicke-Korsakoff syndrome (Medical Encyclopedia)

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Vascular Diseases

What are vascular diseases?

Your vascular system is your body's network of blood vessels. It includes your

  • Arteries, which carry oxygen-rich blood from your heart to your tissues and organs
  • Veins, which carry the blood and waste products back to your heart
  • Capillaries, which are tiny blood vessels that connect your small arteries to your small veins. The walls of the capillaries are thin and leaky, to allow for an exchange of materials between your tissues and blood.

Vascular diseases are conditions which affect your vascular system. They are common and can be serious. Some types include

  • Aneurysm - a bulge or "ballooning" in the wall of an artery
  • Atherosclerosis - a disease in which plaque builds up inside your arteries. Plaque is made up of fat, cholesterol, calcium, and other substances found in the blood.
  • Blood clots, including deep vein thrombosis and pulmonary embolism
  • Coronary artery disease and carotid artery disease, diseases that involve the narrowing or blockage of an artery. The cause is usually a buildup of plaque.
  • Raynaud's disease - a disorder that causes the blood vessels to narrow when you are cold or feeling stressed
  • Stroke - a serious condition that happens when blood flow to your brain stops.
  • Varicose veins - swollen, twisted veins that you can see just under the skin
  • Vasculitis - inflammation of the blood vessels

What causes vascular diseases?

The causes of vascular diseases depend on the specific disease. These causes include

  • Genetics
  • Heart diseases such as high cholesterol and high blood pressure
  • Infection
  • Injury
  • Medicines, including hormones

Sometimes the cause is unknown.

Who is at risk for vascular diseases?

The risk factors for vascular diseases can vary, depending on the specific disease. But some of the more common risk factors include

  • Age - your risk of some diseases goes up as you get older
  • Conditions that can affect the heart and blood vessels, such as diabetes or high cholesterol
  • Family history of vascular or heart diseases
  • Infection or injury that damages your veins
  • Lack of exercise
  • Obesity
  • Pregnancy
  • Sitting or standing still for long periods of time
  • Smoking

What are the symptoms of vascular diseases?

The symptoms for each disease are different.

How are vascular diseases diagnosed?

To make a diagnosis, your health care provider will do a physical exam and ask about your symptoms and medical history. You may have imaging tests and/or blood tests.

How are vascular diseases treated?

Which treatment you get depends on which vascular disease you have and how severe it is. Types of treatments for vascular diseases include

  • Lifestyle changes, such as eating a heart-healthy diet and getting more exercise
  • Medicines, such as blood pressure medicines, blood thinners, cholesterol medicines, and clot-dissolving drugs. In some cases, providers use a catheter to send medicine directly to a blood vessel.
  • Non-surgical procedures, such as angioplasty, stenting, and vein ablation
  • Surgery

Can vascular diseases be prevented?

There are steps you can take to help prevent vascular diseases:

  • Make healthy lifestyle changes, such as eating a heart-healthy diet and getting more exercise
  • Don't smoke. If you are already a smoker, talk to your health care provider for help in finding the best way for you to quit.
  • Keep your blood pressure and cholesterol in check
  • If you have diabetes, control your blood sugar
  • Try not to sit or stand for up long periods of time. If you do need to sit all day, get up and move around every hour or so. If you traveling on a long trip, you can also wear compression stockings and regularly stretch your legs.
  • Aortic arch syndrome (Medical Encyclopedia)
  • Arterial embolism (Medical Encyclopedia)
  • Arteriogram (Medical Encyclopedia)
  • Cerebral angiography (Medical Encyclopedia)
  • Duplex ultrasound (Medical Encyclopedia)
  • Venous insufficiency (Medical Encyclopedia)
  • Venous ulcers -- self-care (Medical Encyclopedia)

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