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K90.4 – Malabsorption After Surgery | ICD-10
K90.4 is the ICD-10 code for malabsorption syndromes following surgical procedures. It describes impaired nutrient absorption in the intestine as a result of surgery.
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K90.4 is the ICD-10 code for malabsorption syndromes following surgical procedures. It describes impaired nutrient absorption in the intestine as a result of surgery.
What Does the ICD-10 Code K90.4 Mean?
The ICD-10 code K90.4 stands for malabsorption syndromes following surgical procedures. Malabsorption refers to impaired absorption of nutrients, vitamins, minerals, and trace elements in the small or large intestine. When this impairment occurs as a direct consequence of gastrointestinal surgery, it is classified under this code.
Causes
The code K90.4 is assigned when malabsorption is caused by a surgical procedure. Typical triggers include:
- Gastrectomy (partial or complete removal of the stomach, e.g., for gastric cancer or bariatric surgery)
- Small bowel resection (removal of parts of the small intestine, e.g., for Crohn disease or bowel cancer)
- Bariatric procedures such as gastric bypass or sleeve gastrectomy
- Stoma formation (creation of an artificial bowel opening)
- Colectomy (removal of the colon)
These procedures can reduce the absorptive surface area of the intestine, alter the transit time of food, or impair the production of digestive enzymes and secretions.
Symptoms
Symptoms of postoperative malabsorption can vary depending on the type and extent of the surgical procedure. Common complaints include:
- Chronic diarrhea or loose stools
- Steatorrhea: oily, foul-smelling stools with a high fat content
- Unintentional weight loss
- Anaemia due to deficiency of iron, vitamin B12, or folate
- Bone loss (osteoporosis) due to calcium and vitamin D deficiency
- General weakness and fatigue
- Changes to the oral mucosa due to vitamin and trace element deficiencies
- Abdominal pain and bloating
Diagnosis
The diagnosis of postoperative malabsorption is established using various investigations:
- Blood tests: measurement of albumin, prealbumin, vitamins (B12, D, E, K), minerals (calcium, magnesium, zinc, iron), and haemoglobin
- Stool tests: detection of fat in stool (faecal fat test), elastase test to assess pancreatic function
- Imaging procedures: ultrasound, computed tomography (CT), or endoscopy to evaluate the remaining bowel
- Breath tests: e.g., H2 breath test to detect small intestinal bacterial overgrowth (SIBO)
Treatment
Treatment is guided by the underlying cause and severity of the malabsorption:
Nutritional Therapy
An adapted nutritional therapy forms the cornerstone of treatment. Depending on the clinical situation, options include:
- High-calorie, easily absorbed diet
- Small, frequent meals
- Low-fat diet for steatorrhea, potentially supplemented with MCT fats (medium-chain triglycerides)
- Enteral nutrition (tube feeding) or parenteral nutrition (intravenous administration) in severe malnutrition
Nutrient Supplementation
Deficient nutrients are replaced in a targeted manner, for example:
- Vitamin B12 (often by injection, as oral absorption may be limited after gastrectomy)
- Iron, folate, calcium, vitamin D, zinc, magnesium
- Fat-soluble vitamins (A, D, E, K)
Pharmacological Treatment
- Pancreatic enzymes in cases of insufficient digestive capacity
- Antibiotics for small intestinal bacterial overgrowth (SIBO)
- Antidiarrhoeal agents for severe diarrhoea
Follow-up Monitoring
Regular blood and nutrient monitoring is essential to detect deficiencies early and to adjust therapy accordingly.
References
- World Health Organization (WHO): ICD-10 Version 2019 – K90 Intestinal malabsorption. Available at: https://icd.who.int/browse10/2019/en#/K90
- Mundi MS et al.: Prevalence of home parenteral and enteral nutrition in the United States. Nutr Clin Pract. 2017;32(6):799–805. doi:10.1177/0884533617718472
- Buchman AL: Short bowel syndrome. Clin Gastroenterol Hepatol. 2005;3(11):1066–1070. doi:10.1016/s1542-3565(05)00536-0
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