ICD-10 Diagnosis Code K90

Intestinal malabsorption

Diagnosis Code K90

ICD-10: K90
Short Description: Intestinal malabsorption
Long Description: Intestinal malabsorption
This is the 2018 version of the ICD-10-CM diagnosis code K90

Not Valid for Submission
The code K90 is a "header" and not valid for submission for HIPAA-covered transactions.

Code Classification
  • Diseases of the digestive system (K00–K93)
    • Other diseases of the digestive system (K90-K95)
      • Intestinal malabsorption (K90)

Information for Patients


Malabsorption Syndromes

Your small intestine does most of the digesting of the foods you eat. If you have a malabsorption syndrome, your small intestine cannot absorb nutrients from foods.

Causes of malabsorption syndromes include

  • Celiac disease
  • Lactose intolerance
  • Short bowel syndrome. This happens after surgery to remove half or more of the small intestine. You might need the surgery if you have a problem with the small intestine from a disease, injury, or birth defect.
  • Whipple disease, a rare bacterial infection
  • Genetic diseases
  • Certain medicines

Symptoms of different malabsorption syndromes can vary. They often include chronic diarrhea, abnormal stools, weight loss, and gas. Your doctor may use lab, imaging, or other tests to make a diagnosis.

Treatment of malabsorption syndromes depends on the cause.

  • Blind loop syndrome (Medical Encyclopedia)
  • D-xylose absorption (Medical Encyclopedia)
  • Fecal fat (Medical Encyclopedia)
  • Lower GI Series - NIH (National Institute of Diabetes and Digestive and Kidney Diseases)
  • Malabsorption (Medical Encyclopedia)
  • Short bowel syndrome (Medical Encyclopedia)
  • Small bowel bacterial overgrowth (Medical Encyclopedia)
  • Stools - floating (Medical Encyclopedia)
  • Whipple Disease - NIH (National Institute of Diabetes and Digestive and Kidney Diseases)
  • Whipple disease (Medical Encyclopedia)


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