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CPT Code 99213 is an Evaluation and Management (E/M) code for an established patient office or outpatient visit lasting 20-29 minutes or requiring low-level medical decision-making (MDM)

Additionally, vitamin B12 is an important cofactor for nutrient metabolism

Proceedings of the National Academy of Sciences of the United States of America 2019;116, 22624-22634, doi:10.1073/pnas.1915905116