ICD-10 Code K90.49 – Malabsorption due to intolerance, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K90.49 – Malabsorption due to intolerance, not elsewhere classified
What it is
K90.49 identifies malabsorption caused by an intolerance that does not fit a more specific ICD-10 category. Use it when impaired nutrient absorption is documented, but the exact intolerance is not named elsewhere.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records may describe chronic diarrhea, bloating, weight loss, or nutrient deficiency linked to a specific food or substance intolerance.
When to use this code
Use K90.49 when the provider documents malabsorption related to intolerance and no more specific code applies. It is appropriate when the chart supports an intolerance-driven absorption problem, but the causal agent is not further classified. If the record names a specific condition, code that condition instead.
Do not use for
Do not use this code for general food intolerance without malabsorption, or for malabsorption from a clearly defined cause. Check documentation if the record instead supports celiac disease, pancreatic disease, or another specified disorder.
Coding tip
Code the documented intolerance and the malabsorption only when the provider clearly links them.