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Yes, for Medicare claims

The human body is a highly efficient system, but it needs proper nutrients to operate at its peak

[153] There is evidence that for elderly people, physicians often repeatedly prescribe and administer cyanocobalamin injections inappropriately, evidenced by the majority of subjects in one large study either having had normal serum concentrations or having not been tested before the injections

Long-term use of proton pump inhibitors and metformin can impair B12 absorption, necessitating monitoring or parenteral therapy

Therefore, serum B 12 values above the cut-off point of deficiency do not necessarily confirm adequate B 12 status