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K59.3 Megacolon – ICD-10, Causes & Treatment
K59.3 is the ICD-10 code for megacolon, an abnormal enlargement of the large intestine. It can be congenital or acquired and always requires medical evaluation.
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K59.3 is the ICD-10 code for megacolon, an abnormal enlargement of the large intestine. It can be congenital or acquired and always requires medical evaluation.
What Does ICD-10 Code K59.3 Mean?
The ICD-10 code K59.3 refers to megacolon – an abnormal and excessive dilation (enlargement) of the large intestine (colon). The term derives from the Greek word “megas” (large) combined with “colon.” This code is used in clinical documentation, billing, and medical records to classify this condition.
Types of Megacolon
Megacolon is generally divided into two main categories:
- Congenital megacolon (Hirschsprung disease): A birth defect in which nerve cells are absent from part of the large intestine, disrupting normal bowel movements. Note that Hirschsprung disease is typically classified under its own ICD-10 code (Q43.1), while K59.3 covers acquired or unspecified megacolon.
- Acquired (toxic) megacolon: A life-threatening complication most commonly associated with inflammatory bowel diseases such as ulcerative colitis or Crohn's disease. It can also be triggered by infections (e.g., Clostridioides difficile) or certain medications.
Causes
The causes of megacolon vary depending on the type:
- Congenital absence of nerve cells in the bowel wall (aganglionosis)
- Chronic inflammatory bowel disease (IBD)
- Bacterial or viral intestinal infections
- Long-term use of certain medications (e.g., laxatives, opioids)
- Metabolic disorders (e.g., hypothyroidism, diabetes mellitus)
- Neurological conditions (e.g., Parkinson's disease, multiple sclerosis)
Symptoms
Symptoms of megacolon can vary in severity depending on the underlying cause:
- Severe constipation (obstipation) or complete bowel obstruction
- Abdominal bloating and distension
- Abdominal pain and cramping
- Fever (especially in toxic megacolon)
- Nausea and vomiting
- General feeling of illness
Toxic megacolon is a medical emergency. Without prompt treatment, it can lead to bowel perforation and life-threatening inflammation of the abdominal cavity (peritonitis).
Diagnosis
Diagnosis of megacolon is established through several methods:
- Abdominal X-ray: Often the first imaging step; shows colonic dilation clearly.
- Computed tomography (CT scan): Provides detailed images of the abdomen to assess extent and underlying cause.
- Endoscopy (colonoscopy): Direct visualization of the bowel lining; used cautiously in toxic megacolon.
- Laboratory tests: Inflammatory markers (CRP, white blood cell count), electrolytes, stool cultures.
- Biopsy: To examine nerve ganglia when Hirschsprung disease is suspected.
Treatment
Treatment depends on the underlying cause and severity of the condition:
Conservative Treatment
- Treating the underlying disease (e.g., anti-inflammatory medications for IBD)
- Antibiotics for infectious causes
- Discontinuing causative medications
- Rectal tube or enema for decompression
- Fluid and electrolyte replacement
Surgical Treatment
- If conservative measures fail or complications arise (perforation, peritonitis), surgery is required.
- Depending on the situation, resection of the affected bowel segment or creation of a colostomy (artificial bowel opening) may be necessary.
References
- World Health Organization (WHO) – ICD-10: International Statistical Classification of Diseases and Related Health Problems, 10th Revision. WHO, Geneva.
- Longo, D.L. et al. – Harrison's Principles of Internal Medicine, 21st Edition. McGraw-Hill Education, 2022.
- Feuerstadt, P. et al. – “Toxic Megacolon.” StatPearls Publishing, 2023. Available via PubMed/NCBI.
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