D51.2 — Transcobalamin II deficiency
D51.2 is a billable, specific ICD-10-CM code for transcobalamin ii deficiency. It is valid for submission on a claim.
Other codes that can never be billed with D51.2
These codes carry an Excludes1 note pointing at D51.2. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading D51.2 alone.
- E72.1Disorders of sulfur-bearing amino-acid metabolism
Risk adjustment
D51.2 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.
Medicare coverage
D51.2 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56416Billing and Coding: Assays for Vitamins and Metabolic Function
- A56464Billing and Coding: Flow Cytometry
- A56675Billing and Coding: Homocysteine Level, Serum
- A57755Billing and Coding: Vitamin B<sub>12</sub> Injections
How D51.2 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to D51.2.
- Deficiency, deficient›transcobalamine II(anemia)
- Anemia›deficiency›transcobalamin II
- Anemia›due to›transcobalamin II deficiency
Related codes at this level
Codes that share D51. If D51.2 is not quite right, the correct code is usually one of these.
Questions about D51.2
- Is D51.2 a billable ICD-10-CM code?
- Yes. D51.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does D51.2 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).