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D57.1 - Sickle-Cell Disease Without Crisis
D57.1 is the ICD-10 code for sickle-cell disease without crisis. It is an inherited disorder of red blood cells that causes chronic anaemia and organ complications.
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D57.1 is the ICD-10 code for sickle-cell disease without crisis. It is an inherited disorder of red blood cells that causes chronic anaemia and organ complications.
What is D57.1?
D57.1 is an ICD-10 diagnosis code that refers to sickle-cell disease without crisis. It is a hereditary blood disorder in which red blood cells contain an abnormal form of haemoglobin called haemoglobin S (HbS). Unlike acute sickle-cell crisis (coded separately), D57.1 describes the stable, non-crisis phase of the disease in which patients still experience chronic symptoms and complications.
Causes
Sickle-cell disease is inherited in an autosomal recessive pattern. A point mutation in the HBB gene causes the production of abnormal haemoglobin S instead of normal haemoglobin A.
- Both parents must carry the mutated gene for a child to develop the full disease.
- Under conditions of low oxygen, dehydration, or physical stress, HbS molecules polymerise, distorting red blood cells into a rigid, sickle shape.
- These misshapen cells block small blood vessels and are destroyed more rapidly than normal red blood cells.
Symptoms
Even in the absence of an acute crisis, patients with D57.1 experience ongoing health issues:
- Chronic anaemia: fatigue, pallor, and shortness of breath
- Jaundice: caused by the accelerated breakdown of sickle cells
- Splenomegaly: enlargement of the spleen, particularly in younger patients
- Increased susceptibility to infections, especially from encapsulated bacteria such as pneumococcus
- Growth delays and delayed puberty in children
- Gradual organ damage due to repeated episodes of impaired blood flow
Diagnosis
The diagnosis of sickle-cell disease is confirmed through several investigations:
- Haemoglobin electrophoresis: demonstrates HbS as the predominant haemoglobin fraction
- Full blood count: reveals normochromic, normocytic anaemia; sickle cells visible on blood smear
- Genetic testing: confirms the specific HBB gene mutation
- Newborn screening: routinely performed in many countries to enable early intervention
Treatment
The only curative treatment is haematopoietic stem cell transplantation, which is not suitable for all patients. Management during the stable phase (D57.1) includes:
- Hydroxyurea (hydroxycarbamide): stimulates production of foetal haemoglobin (HbF), reducing sickling episodes
- Folic acid supplementation: supports increased red blood cell production
- Vaccinations: especially against pneumococcus, meningococcus, and Haemophilus influenzae
- Penicillin prophylaxis in children under 5 years of age
- Regular medical monitoring to detect organ complications early
- Gene therapy: newer approaches including CRISPR-based gene correction are currently in clinical trials
Prognosis and Outlook
Sickle-cell disease is a lifelong condition, but advances in treatment have significantly improved life expectancy over recent decades. Consistent medical care is essential to prevent and manage complications such as stroke, kidney disease, and pulmonary hypertension. Early diagnosis and preventive strategies play a critical role in improving patient outcomes.
References
- World Health Organization (WHO): Sickle-cell disease and other haemoglobin disorders. Fact Sheet, 2023. Available at: https://www.who.int
- National Heart, Lung, and Blood Institute (NHLBI): Evidence-Based Management of Sickle Cell Disease. Expert Panel Report, 2014. Available at: https://www.nhlbi.nih.gov
- Kassim AA, Sharma D. Hematopoietic stem cell transplantation for sickle cell disease: The changing landscape. Hematology/Oncology and Stem Cell Therapy. 2017;10(4):259-266.
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