3A01.4 Vitamin B12 deficiency anaemia due to intestinal disease International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2026-01 A number of intestinal disorders can also cause vitamin B12 (cobalamin) deficiency. These include severe pancreatic diseases and small bowel diseases such as malabsorption, ileal disease (including tuberculous ileitis, lymphoma, amyloid, long-term survivors of pelvic irradiation), extensive small bowel resection or bypass, gastric surgery/reconstruction for obesity (bariatric surgery) and Crohn's disease. When jejunal blind loops are present, bacterial overgrowth within the loops competes for cobalamin, leading to cobalamin deficiency. Although not as common currently, infestation with the fish tapeworm, Diphyllobothrium latum, was once a classic cause of cobalamin deficiency.
postcoordination Add Stem and/or Extension codes to form a cluster code which adds detail to the condition.
Has causing condition - a selection is required - multiple selections are allowed [select] DA90 Nonstructural developmental anomalies of small intestine DA91 Obstruction of small intestine DA92 Other acquired anatomical alterations of small intestine DA93 Motility disorders of small intestine DA94 Noninfectious enteritis or ulcer of small intestine DA95 Coeliac disease DA96 Intestinal malabsorption or protein-losing enteropathy DA97 Certain vascular disorders of small intestine DA98 Polyps of small intestine DA9Y Other specified diseases of small intestine DA9Z Diseases of small intestine, unspecified DA90.0 Syndromic diarrhoea DA90.1 Congenital intestinal transport defect DA90.2 Congenital intestinal motility disorders DA90.Y Other specified nonstructural developmental anomalies of small intestine DA90.Z Nonstructural developmental anomalies of small intestine, unspecified DA91.0 Intussusception of small intestine DA91.1 Volvulus of small intestine DA91.2 Intestinal adhesions or bands of small intestine with obstruction DA91.3 Obstructive ileus of small intestine due to impaction DA91.Y Other specified obstruction of small intestine DA91.Z Obstruction of small intestine, unspecified DA92.0 Fistula of small intestine DA92.1 Pneumatosis intestinalis of small intestine DA92.Y Other specified acquired anatomical alterations of small intestine DA92.Z Acquired anatomical alterations of small intestine, unspecified DA93.0 Paralytic ileus DA93.Y Other specified motility disorders of small intestine DA93.Z Motility disorders of small intestine, unspecified DA94.0 Primary ulcer of small intestine DA94.1 Drug-induced or toxic enteritis of small intestine DA94.2 Allergic or dietetic enteritis of small intestine DA94.3 Enteritis or ulcer of small intestine due to other external causes DA94.Y Other specified noninfectious enteritis or ulcer of small intestine DA94.Z Noninfectious enteritis or ulcer of small intestine, unspecified DA96.0 Intestinal malabsorption DA96.1 Protein-losing enteropathy DA96.Y Other specified intestinal malabsorption or protein-losing enteropathy DA96.Z Intestinal malabsorption or protein-losing enteropathy, unspecified DA97.0 Angiodysplasia of small intestine DA97.1 Arteriovenous malformation of small intestine DA97.2 Vasculitis of mesenteric arteries DA97.3 Varices of small intestine DA97.Z Certain vascular disorders of small intestine, unspecified DA98.0 Hamartoma of small intestine DA98.1 Hyperplastic polyp of small intestine DA98.2 Inflammatory fibroid polyp of small intestine DA98.3 Lymphoid hyperplasia of small intestine DA98.Y Other specified polyps of small intestine DA98.Z Polyps of small intestine, unspecified DA91.30 Gallstone ileus of small intestine DA91.31 Enterolith of small intestine DA91.3Y Other specified obstructive ileus of small intestine due to impaction DA91.3Z Obstructive ileus of small intestine due to impaction, unspecified DA94.00 Primary nonspecific ulceration of small intestine DA94.01 Chronic non-specific multiple ulcers of small intestine DA94.02 Cryptogenic multifocal ulcerous stenosing enteritis DA94.0Y Other specified primary ulcer of small intestine DA94.0Z Primary ulcer of small intestine, unspecified DA94.20 IgE mediated allergic enteritis of small intestine DA94.21 Eosinophilic enteritis DA94.22 Food protein-induced enterocolitis syndrome DA94.2Y Other specified allergic or dietetic enteritis of small intestine DA94.2Z Allergic or dietetic enteritis of small intestine, unspecified DA94.30 Enteritis or ulcer of small intestine due to foreign body DA94.31 Enteritis or ulcer of small intestine due to radiation DA94.32 Enteritis or ulcer of small intestine due to trauma DA94.3Z Enteritis or ulcer of small intestine due to other external causes, unspecified DA96.00 Bacterial overgrowth syndrome DA96.01 Tropical sprue DA96.02 Malabsorption or intolerance of specific nutrients DA96.04 Short bowel syndrome DA96.05 Intestinal failure DA96.0Y Other specified intestinal malabsorption DA96.0Z Intestinal malabsorption, unspecified DB30 Obstruction of large intestine DB31 Other acquired anatomical alterations of large intestine DB32 Motility disorders of large intestine DB33 Certain noninfectious colitis or proctitis DB34 Certain vascular disorders of large intestine DB35 Polyp of large intestine DB36 Certain infections of the large intestine DB3Y Other specified diseases of large intestine DB3Z Diseases of large intestine, unspecified DB30.0 Intussusception of the large intestine DB30.1 Volvulus of large intestine DB30.2 Adhesions of large intestine with obstruction DB30.3 Impaction of large intestine DB30.4 Stenosis of the rectum DB30.Y Other specified obstruction of large intestine DB30.Z Obstruction of large intestine, unspecified DB31.0 Fistula of large intestine DB31.1 Pneumatosis intestinalis of large intestine DB31.2 Rectal prolapse DB31.Y Other specified acquired anatomical alterations of large intestine DB31.Z Acquired anatomical alterations of large intestine, unspecified DB32.0 Pseudo-obstruction of colon DB32.1 Slow transit constipation DB32.2 Megacolon DB32.3 Acquired hypoganglionosis of large intestine DB32.Y Other specified motility disorders of large intestine DB32.Z Motility disorders of large intestine, unspecified DB33.0 Primary ulcer of colon DB33.1 Microscopic colitis DB33.2 Allergic or dietetic colitis DB33.3 Diversion colitis DB33.4 Colitis or proctitis due to external causes DB33.Y Other specified noninfectious colitis or proctitis DB33.Z Noninfectious colitis or proctitis, unspecified DB34.0 Angiodysplasia of colon DB34.1 Arteriovenous malformation of large intestine DB34.2 Vasculitis of large intestine DB34.3 Varices of large intestine DB34.4 Acute haemorrhagic rectal ulcer DB34.Y Other specified vascular disorders of large intestine DB34.Z Vascular disorders of large intestine, unspecified DB35.0 Hyperplastic polyp of large intestine DB35.1 Inflammatory polyp of large intestine DB35.2 Benign lymphoid polyp of large intestine DB35.3 Hamartomatous polyp of large intestine DB35.4 Inflammatory fibroid polyp of large intestine DB35.Y Other specified polyp of large intestine DB35.Z Polyp of large intestine, unspecified DB36.0 Colonic abscess DB36.1 Rectal abscess DB36.Y Other specified infections of the large intestine DB36.Z Infections of the large intestine, unspecified DB32.20 Toxic megacolon DB32.2Y Other specified megacolon DB32.2Z Megacolon, unspecified DB33.10 Collagenous colitis DB33.11 Lymphocytic colitis DB33.1Y Other specified microscopic colitis DB33.1Z Microscopic colitis, unspecified DB33.20 Food protein-induced proctitis or colitis of infants DB33.2Y Other specified allergic or dietetic colitis DB33.2Z Allergic or dietetic colitis, unspecified DB33.40 Chemical colitis or proctitis DB33.41 Radiation-induced colitis DB33.42 Radiation proctitis DB33.43 Drug-induced colitis DB33.4Y Other specified colitis or proctitis due to external causes DB33.4Z Colitis or proctitis due to external causes, unspecified DB36.10 Perirectal abscess DB36.11 Ischiorectal abscess DB36.12 Rectal cellulitis
synonyms Vitamin B12 deficiency anaemia due to intestinal disease Acquired megaloblastic anaemia due to vitamin B12 deficiency secondary to intestinal disease
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