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5C61.6 Lactose intolerance

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2026-01

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.

sections/codes in this section ()

• Primary lactase deficiency  (5C61.60)
• Congenital lactase deficiency  (5C61.61)
• Secondary lactase deficiency  (5C61.62)
• Lactose intolerance, unspecified  (5C61.6Z)

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