Is D51 a billable ICD-10-CM code?

No. D51 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does D51 sit in the tabular list?

Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89), in the block Nutritional anemias (D50-D53).

D51

D51 — Vitamin B12 deficiency anemia

Non-billable headerICD-10-CM

D51 is a non-billable header ICD-10-CM code for vitamin b12 deficiency anemia. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

deficiency of other B group vitamins (E53-)

Other codes that can never be billed with D51

These codes carry an Excludes1 note pointing at D51. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading D51 alone.

E72.1Disorders of sulfur-bearing amino-acid metabolism

Risk adjustment

D51 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead D51

6 child codes. Green means billable.

Questions about D51

Is D51 a billable ICD-10-CM code?: No. D51 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does D51 sit in the tabular list?: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89), in the block Nutritional anemias (D50-D53).