In the Original Investigation titled “Associations of Serum Folate and Vitamin B12 Levels With Cardiovascular Disease Mortality Among Patients With Type 2 Diabetes,”1 published January 31, 2022, there were errors in panel B of the Figure; the unit of measure for serum B12 should be picograms per milliliter. There was an error in the title of Table 3; the years of the National Health and Nutrition Examination Survey should be from 1999 through 2014. This article has been corrected.1