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CMS introduced JZ specifically because practices were failing to document waste one way or the other, and the absence of documentation made it impossible to determine whether overbilling had occurred

Pernicious Anemia: The Hematological Presentation of a Multifaceted Disorder Caused by Cobalamin Deficiency. Nutrients, vol

Homocysteine, vitamin B12, and folic acid levels in Alzheimer's disease, mild cognitive impairment, and healthy elderly: baseline characteristics in subjects of the Australian Imaging Biomarker Lifestyle Study

And, indeed, in a comparison of chewable 50 microgram daily doses to 2,000 once-a-week doses in vegans and vegetarians with marginal deficiency, they both worked just as well in bringing down MMA and homocysteine levels