D64.3 – Sideroblastic Anaemia: Causes & Treatment
D64.3 is the ICD-10 code for other sideroblastic anaemias, where iron accumulates abnormally in bone marrow red cell precursors, impairing haemoglobin production and causing anaemia.
Things worth knowing about "D64.3"
D64.3 is the ICD-10 code for other sideroblastic anaemias, where iron accumulates abnormally in bone marrow red cell precursors, impairing haemoglobin production and causing anaemia.
What is D64.3?
The ICD-10 code D64.3 refers to other sideroblastic anaemias – a group of blood disorders in which the bone marrow is unable to properly incorporate iron into haemoglobin, the oxygen-carrying protein in red blood cells. Instead, iron accumulates in the mitochondria of developing red blood cell precursors (erythroblasts), forming characteristic ring-shaped deposits known as ring sideroblasts. This code is used when the condition cannot be attributed to drug use or other clearly defined causes covered by separate ICD-10 codes.
Causes
Sideroblastic anaemias classified under D64.3 can arise from several different causes:
- Hereditary forms: Mutations in genes involved in haem synthesis or iron metabolism, such as ALAS2 or SLC25A38.
- Idiopathic acquired forms: No identifiable external cause; often associated with myelodysplastic syndromes (MDS).
- Metabolic disorders: For example, copper deficiency, which impairs enzymes involved in iron utilisation.
- Mitochondrial diseases: Rare defects in mitochondrial function that disrupt haem synthesis.
- Other systemic conditions: Inflammatory or systemic diseases that affect iron metabolism.
Symptoms
The symptoms are typical of anaemia and may vary in severity:
- Fatigue, weakness, and general malaise
- Pale skin and mucous membranes
- Shortness of breath during physical activity
- Heart palpitations
- Dizziness and headaches
- In chronic cases: signs of iron overload (haemosiderosis), such as liver disease, heart problems, or diabetes
Diagnosis
The diagnosis of sideroblastic anaemia (D64.3) is based on a combination of investigations:
- Full blood count: Typically reveals a hypochromic (pale) and microcytic (small cell) or normocytic anaemia.
- Iron studies: Elevated serum iron, high transferrin saturation, and normal or raised ferritin levels.
- Bone marrow biopsy: Detection of ring sideroblasts (more than 15% of erythroblasts) using Prussian blue staining – the key diagnostic criterion.
- Genetic testing: To identify hereditary forms.
- Exclusion of other causes: Such as medications, alcohol use, or vitamin B6 deficiency.
Treatment
Treatment depends on the underlying cause:
- Vitamin B6 (pyridoxine): High-dose pyridoxine supplementation may be effective in certain hereditary forms (e.g. ALAS2 mutations).
- Treatment of the underlying condition: For example, copper supplementation in copper deficiency.
- Blood transfusions: For symptomatic relief in severe anaemia.
- Iron chelation therapy: In cases of iron overload, chelating agents such as deferoxamine are used to remove excess iron from the body.
- Stem cell transplantation: May be considered in severe or refractory cases.
References
- World Health Organization (WHO): ICD-10 International Classification of Diseases, 10th Revision – D64.3 Other sideroblastic anaemias.
- Bottomley, S. S. & Fleming, M. D. (2014): Sideroblastic anaemia: diagnosis and management. British Journal of Haematology, 164(6), 818–830.
- Steensma, D. P. (2011): The changing classification of sideroblastic disorders. Hematology, American Society of Hematology Education Program, 2011, 116–120.
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