D51.8 ICD-10-CM Code: Other vitamin B12 deficiency anemias
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89) / Nutritional anemias (D50-D53)
D51.8
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther vitamin B12 deficiency anemias
This code describes anemia (low red blood cell count) caused by vitamin B12 deficiency that doesn't fit into the more common categories like pernicious anemia or dietary deficiency. It includes rare or unusual forms of B12 deficiency anemia.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
Basket needed
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for D51.8 in this effective period.
Excludes 2
Official- deficiency of other B group vitamins (E53-)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for D51.8 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for D51.8 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for D51.8 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for D51.8 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for D51.8 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is D51.8 an HCC code?
No. D51.8 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
D51.8 is the ICD-10-CM diagnosis code for other vitamin b12 deficiency anemias. This code describes anemia (low red blood cell count) caused by vitamin B12 deficiency that doesn't fit into the more common categories like pernicious anemia or dietary deficiency. It includes rare or unusual forms of B12 deficiency anemia. D51.8 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).
D51.8 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.
Use this code only when the specific type of B12 deficiency anemia is documented but doesn't match D51.0 (pernicious anemia), D51.1 (vitamin B12 deficiency due to dietary causes), D51.2 (transcobalamin II deficiency), or D51.3 (vitamin B12 deficiency of other specified type).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for D51.8 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the specific type of B12 deficiency anemia is documented but doesn't match D51.0 (pernicious anemia), D51.1 (vitamin B12 deficiency due to dietary causes), D51.2 (transcobalamin II deficiency), or D51.3 (vitamin B12 deficiency of other specified type)
- •Always investigate and document the underlying cause of B12 deficiency when possible, as this may affect treatment and management decisions