Vitamin B12 deficiency anemia (D51)

Vitamin B12 deficiency anemia (ICD-10 code D51) encompasses a group of anemia types caused by insufficient vitamin B12 levels, affecting red blood cell production. These codes are used specifically to classify different causes and forms of this anemia, including inherited, dietary, and malabsorption-related deficiencies.

This section details subtypes such as D51.0, which covers vitamin B12 deficiency anemia due to intrinsic factor deficiency, commonly known as pernicious anemia; an autoimmune condition impairing vitamin B12 absorption. D51.1 identifies anemia from selective malabsorption with proteinuria, while D51.2 is for transcobalamin II deficiency, a rare inherited disorder affecting vitamin B12 transport. Dietary causes, including vegan or vegetarian diets leading to deficiency, fall under D51.3. Other causes, such as post-gastrectomy anemia or chronic gastritis-related B12 deficiency, are coded as D51.8. Unspecified cases are captured by D51.9. Understanding synonyms like pernicious anemia, vegan's anemia, or megaloblastic anemia helps clinicians connect clinical terms to their proper ICD-10 code, ensuring accurate coding of vitamin B12 deficiency anemia in medical records.