ICD-11 classes
05 Endocrine, nutritional or metabolic diseases
Metabolic disorders
Disorders of metabolite absorption or transport
5C61 — Disorders of carbohydrate absorption or transport
5C61.6 — Lactose intolerance

ICD-11 5C61.6 — Lactose intolerance

Lactose intolerance is the inability to digest lactose, a sugar found in milk and some dairy products, due to a deficiency of lactase, the enzyme that metabolizes lactose. Lactose intolerance occurs when lactose is not completely broken down and consequently the sugar cannot be absorbed into the blood.

The diagnosis includes nothing.

The diagnosis excludes nothing.

Diagnosis with code 5C61.6 contains 4 clarifying diagnoses:

1. 5C61.60 — Primary lactase deficiency
2. 5C61.61 — Congenital lactase deficiency
3. 5C61.62 — Secondary lactase deficiency
4. 5C61.6Z — Lactose intolerance, unspecified

The diagnosis is coded elsewhere:

• Malabsorption or intolerance of specific nutrients #13923
• Lactose intolerance #13924