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D57.8 Sickle-Cell Disorder – ICD-10 Explained
D57.8 is the ICD-10 code for other sickle-cell disorders. These are inherited conditions affecting red blood cells, causing anaemia and circulatory complications.
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D57.8 is the ICD-10 code for other sickle-cell disorders. These are inherited conditions affecting red blood cells, causing anaemia and circulatory complications.
What is D57.8?
The ICD-10 code D57.8 refers to other sickle-cell disorders – a group of inherited blood conditions caused by a genetic mutation affecting haemoglobin, the protein in red blood cells that carries oxygen. Under low-oxygen conditions, the red blood cells of affected individuals take on a rigid, sickle-like shape instead of their normal flexible, disc-like form. This code covers forms of sickle-cell disease that do not fall under the more specific ICD-10 codes D57.0 to D57.3.
Causes
Sickle-cell disorders are caused by a mutation in the HBB gene, which encodes the beta-globin chain of haemoglobin. This leads to the production of abnormal haemoglobin S (HbS), which polymerises under deoxygenated conditions and distorts red blood cells into their characteristic sickle shape. The condition is inherited in an autosomal recessive manner, meaning a child must inherit a mutated gene from both parents to develop the disorder.
- Homozygous mutation (HbSS): classic sickle-cell anaemia
- Compound heterozygosity: combination with other haemoglobin variants (e.g. HbSC, HbS/beta-thalassaemia)
- Other rare combinations (classified under D57.8)
Symptoms
Symptoms can vary widely depending on the specific genotype. Common manifestations include:
- Anaemia: fatigue, pallor, and shortness of breath due to reduced red blood cell lifespan
- Painful crises (vaso-occlusive episodes): sudden, severe pain caused by blocked blood vessels, often in bones, joints, or the abdomen
- Splenic infarction: repeated damage to the spleen due to impaired blood flow
- Increased susceptibility to infections: especially from encapsulated bacteria
- Organ damage: kidneys, lungs, eyes, heart, and brain may be affected over time
- Delayed growth and development in children
Diagnosis
The diagnosis is typically established through:
- Full blood count: reveals anaemia and sickle-shaped cells on blood smear
- Haemoglobin electrophoresis or HPLC: identifies the presence of HbS and determines the exact haemoglobin pattern
- Molecular genetic testing: confirms the specific mutation in the HBB gene
- Newborn screening: routinely performed in many countries to enable early intervention
Treatment
A curative approach is currently only possible through allogeneic stem cell transplantation or, more recently, gene therapy. Symptomatic and disease-modifying treatments include:
- Hydroxyurea (hydroxycarbamide): reduces the frequency of painful crises by increasing foetal haemoglobin (HbF) levels
- Pain management: ranging from non-opioid analgesics to opioids depending on crisis severity
- Blood transfusions: used in severe anaemia or to prevent stroke
- Antibiotic prophylaxis and vaccinations: to protect against infection due to functional asplenia
- Folic acid supplementation: to support red blood cell production
- Newer agents such as voxelotor and crizanlizumab are available in specialised centres
References
- Rees DC, Williams TN, Gladwin MT. Sickle-cell disease. Lancet. 2010;376(9757):2018–2031.
- World Health Organization (WHO). Sickle-cell disease and other haemoglobin disorders. Fact Sheet, 2023. Available at: https://www.who.int
- Kato GJ, Piel FB, Reid CD, et al. Sickle cell disease. Nature Reviews Disease Primers. 2018;4:18010.
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