Vit B12 defic anemia d/t slctv vit B12 malabsorp w protein

This code signifies a type of megaloblastic anemia resulting from the body's inability to absorb vitamin B12, specifically due to a defect in the intrinsic factor mechanism, coupled with the presence of proteinuria. This condition is often hereditary and can lead to neurological complications if untreated.

Use this code for patients diagnosed with Imerslund-Gräsbeck syndrome or other congenital selective vitamin B12 malabsorption disorders that also present with proteinuria. Documentation should clearly state the diagnosis of selective B12 malabsorption, the presence of anemia, and confirmed proteinuria.

• Ensure documentation specifies "selective" malabsorption of B12, not general malabsorption.
• Do not confuse with other types of B12 deficiency anemia, such as pernicious anemia (D51.0) or dietary B12 deficiency (D51.3).
• Code any associated neurological manifestations or other complications separately.