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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Endocrine, Nutritional And Metabolic Diseases, And Immunity Disorders 240-279 > Other Metabolic Disorders And Immunity Disorders 270-279 > Disorders Of Carbohydrate Transport And Metabolism 271.* > 2008 ICD-9-CM Diagnosis 271.3 Intestinal disaccharidase deficiencies and disaccharide malabsorption The condition resulting from the absence or deficiency of LACTASE in the MUCOSA cells of the GASTROINTESTINAL TRACT, and the inability to break down LACTOSE in milk for ABSORPTION. Bacterial fermentation of the unabsorbed lactose leads to symptoms that range from a mild indigestion (DYSPEPSIA) to severe DIARRHEA. Lactose intolerance may be an inborn error or acquired. The inability to digest or absorb lactose, a type of sugar found in milk and other dairy products. 271.3 is a specific code that can be used to specify a diagnosis 271.3 contains 20 index entries View the ICD-9-CM Volume 1 271.* hierarchy 271.3 also known as: Intolerance or malabsorption (congenital) (of): glucose-galactose lactose sucrose-isomaltose Index entries containing 271.3: Absorption lactose defect 271.3 Alactasia (hereditary) 271.3 Deficiency, deficient disaccharidase (intestinal) 271.3 invertase 271.3 lactase 271.3 sucrase 271.3 sucrase-isomaltase 271.3 Disorder - see also Disease metabolism NEC 277.9 lactose 271.3 Intolerance dissacharide (hereditary) 271.3 glucose (-galactose) (congenital) 271.3 lactose (hereditary) (infantile) 271.3 sucrose (-isomaltose) (congenital) 271.3 Lacticemia 271.3 excessive 276.2 Lactosuria 271.3 Malabsorption 579.9 disaccharide 271.3 glucose-galactose (congenital) 271.3 isomaltose 271.3 lactose (hereditary) 271.3 sucrose (-isomaltose) (congenital) 271.3 Maltosuria 271.3