D51.0
BillableVitamin B12 deficiency anemia due to intrinsic factor deficiency
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is D51.0 an HCC code?
No. D51.0 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
D51.0 is the ICD-10-CM diagnosis code for vitamin b12 deficiency anemia due to intrinsic factor deficiency. This is a type of anemia caused by the body's inability to produce intrinsic factor, a protein needed to absorb vitamin B12 from food. Without adequate B12 absorption, the body cannot make enough healthy red blood cells, leading to fatigue and weakness. D51.0 sits in the ICD-10-CM chapter for diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (d50-d89), within the section covering nutritional anemias (d50-d53).
D51.0 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
This code is specific to pernicious anemia (the most common cause of intrinsic factor deficiency); do not use this code if the B12 deficiency is due to dietary insufficiency or other causes.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for D51.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code is specific to pernicious anemia (the most common cause of intrinsic factor deficiency); do not use this code if the B12 deficiency is due to dietary insufficiency or other causes
- •Verify documentation confirms the deficiency is specifically due to intrinsic factor deficiency rather than other B12 absorption issues, as this affects code selection