Vitamin B12 Deficiency ICD-10-CM Codes

Discover the ICD-10 codes for Vitamin B12 deficiency. Ensure accurate medical coding and billing for this condition. Simplify diagnosis with proper codes.

By Ericka Pingol on Aug 8, 2025.

Fact Checked by Karina Jimenea.

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What ICD-10 codes are used for Vitamin B12 deficiency

ICD-10 codes are used for accurate medical billing and coding purposes, including the diagnosis of various health conditions.

E53.8 - Deficiency of other specified B group vitamins: This code is used when a patient has a deficiency of Vitamin B12 due to causes other than those explicitly mentioned in other codes.
E53.0 - Riboflavin deficiency: Vitamin B2 (Riboflavin) deficiency can lead to a deficiency of other B vitamins, including Vitamin B12.
E53.1 - Pyridoxine deficiency: Vitamin B6 (Pyridoxine) deficiency may lead to decreased absorption and utilization of Vitamin B12.
E53.9: Vitamin B deficiency, unspecified: This code is used when a B vitamin deficiency is confirmed, but the specific vitamin (e.g., B1, B6, B12) has not been identified in the clinical documentation.
E63.8 - Other specified nutritional deficiencies: Sometimes, Vitamin B12 deficiency is part of a more complex nutritional deficiency, and this code is used in such cases.
D51.0 - Vitamin B12 deficiency anemia due to intrinsic factor deficiency: Intrinsic factor is essential for Vitamin B12 absorption, and its deficiency can lead to a specific type of anemia related to Vitamin B12 deficiency.
D51.1 - Vitamin B12 deficiency anemia due to selective vitamin B12 malabsorption with proteinuria: This code is used when Vitamin B12 deficiency is linked to selective malabsorption and proteinuria, a condition where abnormal amounts of protein are present in the urine.
D51.9 - Vitamin B12 deficiency, unspecified: This code is utilized when the exact cause of Vitamin B12 deficiency is not specified in the medical records.

You can watch the explainer video for a more in-depth understanding of Vitamin B12 deficiency and related ICD-10 codes.

Which Vitamin B12 deficiency ICD codes are billable?

Several ICD-10-CM codes are billable for Vitamin B12 deficiency, primarily within the D51 category. These include D51.0 (due to intrinsic factor deficiency), D51.1 (selective malabsorption with proteinuria), D51.2 (transcobalamin II deficiency), D51.3 (dietary deficiency), D51.8 (other specified B12 deficiency anemias), and D51.9 (unspecified).

Additional billable codes like E53.8, E53.9, and E63.8 may be used when B12 deficiency is part of a broader or unspecified nutritional issue. Still, the D51 codes offer the most direct and specific documentation for B12-related claims.

Clinical information

Vitamin B12, also known as cobalamin, is an essential water-soluble vitamin that plays a crucial role in various physiological processes within the body.
It is primarily involved in the synthesis of DNA, red blood cell formation, and the proper functioning of the nervous system.
The body cannot produce Vitamin B12 independently; therefore, it relies on dietary sources and efficient absorption from the gastrointestinal tract.
Vitamin B12 is naturally found in animal products such as meat, fish, dairy, and eggs. Vegans and vegetarians are at a higher risk of deficiency due to limited dietary intake.
The most common cause of Vitamin B12 deficiency is a lack of intrinsic factor, a protein the stomach produces that is essential for B12 absorption. This leads to pernicious anemia.
Individuals with gastrointestinal disorders like celiac disease, Crohn's disease, or surgical alterations in the gastrointestinal tract may also experience impaired B12 absorption.
Symptoms of Vitamin B12 deficiency may include fatigue, weakness, pale skin, shortness of breath, tingling or numbness in hands and feet, and difficulty maintaining balance.
If left untreated, Vitamin B12 deficiency can lead to severe neurological complications, including neuropathy, cognitive impairment, and depression.
Diagnosis of Vitamin B12 deficiency involves a blood test to measure serum B12 levels, along with other relevant diagnostic tests like complete blood count (CBC) and peripheral blood smear.
Treatment typically involves Vitamin B12 supplementation, either through oral supplements or injections, depending on the severity of the deficiency and the underlying cause.
Regular follow-up and monitoring of Vitamin B12 levels are essential to assess treatment effectiveness and ensure adequate management of the deficiency.
Individuals with conditions or lifestyle factors that increase the risk of Vitamin B12 deficiency should consider incorporating B12-rich foods or supplements into their diets to maintain optimal health.

Synonyms include

Cobalamin deficiency
Vitamin B12 insufficiency
Cyanocobalamin deficiency
Lack of cobalamin
B12 vitamin deficiency
Insufficient Vitamin B12 levels
Deficit of cobalamin
Low B12 levels
Inadequate Vitamin B12
Absence of cyanocobalamin
Pantothenic acid deficiency

Commonly asked questions

Use a Vitamin B12 deficiency ICD code when a patient is clinically diagnosed with low B12 levels, supported by lab results or symptoms such as fatigue, cognitive issues, neuropathy, or anemia.

Yes, vitamin B12 deficiency diagnoses are billable. The most specific and commonly used codes are found in the D51 series.

Treatments typically include intramuscular vitamin B12 injections, high-dose oral or sublingual supplements, and addressing underlying causes such as poor diet, malabsorption, or intrinsic factor deficiency.

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