---
title: "ICD-10-CM D51.2: Transcobalamin II deficiency | BillingBrief"
description: "ICD-10-CM code D51.2: Transcobalamin II deficiency. Category, related codes, and the official source, in plain English."
canonical: "https://billingbrief.com/icd10/d51.2/"
language: "en"
---

# D51.2 Transcobalamin II deficiency

ICD-10-CM · [CMS code reference](#source)

**Official ICD-10-CM description:** Transcobalamin II deficiency

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Excludes2

Not part of this code, but both can be coded when both are documented.

-   deficiency of other B group vitamins (E53-)

## Related codes

-   [`D51.0` Vitamin B12 deficiency anemia due to intrinsic factor deficiency ICD-10-CM](https://billingbrief.com/icd10/d51.0/)
-   [`D51.1` Vitamin B12 deficiency anemia due to selective vitamin B12 malabsorption with proteinuria ICD-10-CM](https://billingbrief.com/icd10/d51.1/)
-   [`D51.3` Other dietary vitamin B12 deficiency anemia ICD-10-CM](https://billingbrief.com/icd10/d51.3/)
-   [`D51.8` Other vitamin B12 deficiency anemias ICD-10-CM](https://billingbrief.com/icd10/d51.8/)
-   [`D51.9` Vitamin B12 deficiency anemia, unspecified ICD-10-CM](https://billingbrief.com/icd10/d51.9/)

## Common questions

### Is D51.2 a billable code?

Yes. D51.2 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

D51 Vitamin B12 deficiency anemia

Chapter

Diseases of the blood and immune mechanism

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).