Vitamin B12 deficiency anemia (D51) ICD-10-CM
The D51 code range covers vitamin b12 deficiency anemia with 7 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- vitamin B12 deficiency E53.8
Codes in the D51 Range 7 codes · 6 billable
- D51 Vitamin B12 deficiency anemiaNon-billable
- D51.0 Vitamin B12 deficiency anemia due to intrinsic factor deficiency
- D51.1 Vitamin B12 deficiency anemia due to selective vitamin B12 malabsorption with proteinuria
- D51.2 Transcobalamin II deficiency
- D51.3 Other dietary vitamin B12 deficiency anemia
- D51.8 Other vitamin B12 deficiency anemias
- D51.9 Vitamin B12 deficiency anemia, unspecified
About the D51 Code Range
Vitamin B12 deficiency anemia (ICD-10 code D51) encompasses a group of anemia types caused by insufficient vitamin B12 levels, affecting red blood cell production. These codes are used specifically to classify different causes and forms of this anemia, including inherited, dietary, and malabsorption-related deficiencies.
This section details subtypes such as D51.0, which covers vitamin B12 deficiency anemia due to intrinsic factor deficiency, commonly known as pernicious anemia—an autoimmune condition impairing vitamin B12 absorption. D51.1 identifies anemia from selective malabsorption with proteinuria, while D51.2 is for transcobalamin II deficiency, a rare inherited disorder affecting vitamin B12 transport. Dietary causes, including vegan or vegetarian diets leading to deficiency, fall under D51.3. Other causes, such as post-gastrectomy anemia or chronic gastritis-related B12 deficiency, are coded as D51.8. Unspecified cases are captured by D51.9. Understanding synonyms like pernicious anemia, vegan's anemia, or megaloblastic anemia helps clinicians connect clinical terms to their proper ICD-10 code, ensuring accurate coding of vitamin B12 deficiency anemia in medical records.
Questions About This Page
How many billable codes are in the D51 range?
Of the 7 codes in this range, 6 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the D51 range classify?
The range classifies vitamin b12 deficiency anemia. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
