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K55.9 - Vascular Disorder of Intestine | ICD-10
K55.9 is an ICD-10 diagnosis code for an unspecified vascular disorder of the intestine. It describes a condition in which blood supply to the bowel is impaired, potentially leading to ischemia and tissue damage.
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K55.9 is an ICD-10 diagnosis code for an unspecified vascular disorder of the intestine. It describes a condition in which blood supply to the bowel is impaired, potentially leading to ischemia and tissue damage.
Definition and ICD-10 Classification
K55.9 is a diagnosis code from the International Classification of Diseases (ICD-10) representing an unspecified vascular disorder of the intestine. It belongs to the K55 group, which covers vascular diseases of the intestine. This code is applied when intestinal ischemia is present but cannot be assigned to a more specific subcategory.
Causes
Intestinal vascular disorders arise from insufficient blood supply to the bowel. Common causes include:
- Arterial occlusion: Blood clots or atherosclerotic plaques can block the mesenteric arteries that supply the intestine.
- Venous thrombosis: Clots in the mesenteric or portal veins impair blood drainage from the bowel.
- Low blood pressure: Prolonged hypotension (e.g., during shock) can critically reduce intestinal perfusion.
- Heart conditions: Heart failure or arrhythmias such as atrial fibrillation can cause emboli that travel to mesenteric vessels.
- Chronic atherosclerosis: Progressive narrowing of mesenteric vessels leads to gradual under-supply of the bowel.
Symptoms
Symptoms depend on the type and severity of the circulatory impairment. Common presentations include:
- Sudden, severe abdominal pain (in acute ischemia)
- Cramping abdominal pain after eating (in chronic ischemia, known as intestinal angina)
- Nausea and vomiting
- Bloody diarrhea
- Bloated, rigid abdomen
- Unintentional weight loss (in chronic forms)
- Fever and general malaise
Diagnosis
Diagnosing intestinal ischemia requires careful clinical evaluation and targeted investigations:
- Laboratory tests: Elevated lactate, leukocytosis, and raised inflammatory markers (CRP, procalcitonin) may indicate intestinal ischemia.
- CT angiography: Computed tomography with contrast is the gold standard for imaging the mesenteric vessels and identifying occlusions.
- Duplex ultrasound: Assesses blood flow in mesenteric vessels non-invasively.
- Colonoscopy: Direct visualization of the bowel mucosa is used when ischemic colitis is suspected.
- MRI: May be used in selected cases for detailed vascular imaging.
Treatment
Treatment depends on the underlying cause and severity of the condition:
Conservative Management
- Administration of anticoagulants to prevent further clot formation
- Fluid and electrolyte replacement
- Pain management
- Treatment of underlying conditions (e.g., heart failure, cardiac arrhythmias)
Interventional and Surgical Treatment
- Catheter-based procedures: Thrombolysis or stenting to restore vessel patency (revascularization)
- Surgical intervention: In cases of extensive bowel necrosis, resection of the affected intestinal segment may be necessary.
Prognosis
Prognosis depends heavily on how quickly the diagnosis is made and treatment is initiated. Acute mesenteric ischemia is a medical emergency with high mortality if not treated promptly. Chronic forms can often be managed well when identified early.
References
- World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10), Volume 1, 2019.
- Tilsed J.V. et al. - ESTES Guidelines: Acute Mesenteric Ischaemia. European Journal of Trauma and Emergency Surgery, 2016.
- Bala M. et al. - Acute mesenteric ischemia: guidelines of the World Society of Emergency Surgery. World Journal of Emergency Surgery, 2017.
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