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Conditions such as Crohn's disease, pernicious anemia, or a history of gastric surgery may increase the risk of B12 deficiency
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Because absorption is limited, raising serum B12 with pills is a gradual, cumulative process that can take weeks or months of consistent daily use
Medicare requires laboratory evidence of deficiency or a confirmed diagnosis such as pernicious anemia, a signed physician order specifying drug name, dose, route, and frequency, an administration record documenting the date, drug, dose, route, site, and administering clinician, and an ICD-10-CM diagnosis code on the claim that traces to a covered indication in the relevant MACs LCD.
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