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D51.1 - Vitamin B12 deficiency anemia due to selective vitamin B12 malabsorption with proteinuria: This code is used for Imerslund-Grasbeck syndrome, a rare disorder causing B12 deficiency, which may resemble pernicious anemia

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The most common side effects are digestive: - Nausea (usually improves over time) - Vomiting - Diarrhea or constipation - Stomach pain These are usually manageable with slow dose increases