D51Vitamin B12 deficiency anemia

D51 is the ICD-10-CM diagnosis code for vitamin B12 deficiency anemia. It belongs to block D50-D53 (nutritional anemias) and chapter 3 (diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: D51.0 (due to intrinsic factor deficiency), D51.1 (due to selective vitamin B12 malabsorption with proteinuria), D51.2 (deficiency), D51.3 (anemia), D51.8 (anemias) and D51.9 (unspecified).

The conditions in its Excludes2 note aren't part of D51, but may be coded alongside it if the patient has both: deficiency of other B group vitamins (E53-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.