D51.8 Other Vitamin B12 Deficiency Anemias Use for B12 deficiency from causes not classified elsewhere, such as post-gastrectomy, ileal resection, Crohn disease-related malabsorption, bacterial overgrowth, or long-term medication effects (metformin, proton pump inhibitors, H2 blockers)
Your doctor will run more tests to try to find the cause
If you have certain digestive disorders, including pernicious anemia, or have had gastric bypass surgery, oral B12 will simply not work because you can't absorb it correctly
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