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D64.4 – Congenital Sideroblastic Anemia
D64.4 is the ICD-10 code for congenital sideroblastic anemia, a rare inherited blood disorder in which iron cannot be properly incorporated into red blood cells.
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D64.4 is the ICD-10 code for congenital sideroblastic anemia, a rare inherited blood disorder in which iron cannot be properly incorporated into red blood cells.
What is D64.4?
The ICD-10 code D64.4 refers to congenital sideroblastic anemia (also known as hereditary sideroblastic anemia). This is a rare, inherited form of anemia in which the body absorbs sufficient iron but is unable to incorporate it correctly into hemoglobin, the oxygen-carrying protein in red blood cells. As a result, iron accumulates in the precursors of red blood cells (erythroblasts) and forms ring-shaped deposits around the cell nucleus – these are known as ring sideroblasts, which give the condition its name.
Causes
Congenital sideroblastic anemia is caused by genetic mutations that impair iron metabolism or the synthesis of heme (the iron-containing component of hemoglobin). The most common form is X-linked and primarily affects male patients. It is usually caused by a mutation in the ALAS2 gene, which encodes the enzyme delta-aminolevulinic acid synthase 2 – a key enzyme in heme biosynthesis. Rarer forms follow autosomal-recessive or autosomal-dominant inheritance patterns.
- Mutation in the ALAS2 gene (X-linked)
- Mutations affecting mitochondrial iron metabolism genes
- Defects in mitochondrial DNA
Symptoms
The severity of symptoms can vary widely depending on the genetic cause and individual disease course. Common symptoms include:
- Fatigue and weakness due to reduced oxygen delivery in the blood
- Pale skin (pallor)
- Shortness of breath during physical activity
- Enlarged spleen (splenomegaly) due to increased destruction of defective red blood cells
- Iron overload (hemosiderosis) affecting organs such as the liver and heart
- In children: growth retardation and developmental delays
Diagnosis
Diagnosing congenital sideroblastic anemia involves several steps:
- Complete blood count: Often shows microcytic or dimorphic anemia (a mixture of small and normal-sized red blood cells)
- Iron studies: Serum ferritin and transferrin saturation are typically elevated
- Bone marrow examination: Detection of ring sideroblasts (>15% of erythroblasts) using Prussian blue staining
- Genetic testing: Identification of the causative mutation
Treatment
Treatment depends on the severity of the anemia and the underlying genetic cause:
Pyridoxine (Vitamin B6)
In the most common form (ALAS2 mutation), some patients respond well to high-dose pyridoxine (vitamin B6), as it can support the activity of the defective enzyme. This may lead to a significant improvement in anemia.
Blood Transfusions
In cases of severe anemia that do not respond to pyridoxine, regular blood transfusions are required to maintain adequate hemoglobin levels.
Iron Chelation Therapy
Because the condition – particularly when combined with repeated transfusions – can lead to iron overload in the organs, chelation therapy is often used (e.g., with deferoxamine or deferasirox) to remove excess iron from the body.
Stem Cell Transplantation
In severe cases, especially in children with non-pyridoxine-responsive forms, an allogeneic stem cell transplantation may offer a curative option.
Prognosis
The prognosis strongly depends on the genetic form and the response to therapy. Patients who respond to pyridoxine can achieve a near-normal life expectancy. In severe, transfusion-dependent forms, long-term iron overload poses the greatest risk to organ health.
References
- Bergmann AK, Campagna DR, et al.: Systematic molecular genetic analysis of congenital sideroblastic anemia. Haematologica, 2010;95(7):1121–1127. PubMed PMID: 20418245.
- Cazzola M, Invernizzi R: Ring sideroblasts and sideroblastic anemias. Haematologica, 2011;96(6):789–792. PubMed PMID: 21632939.
- World Health Organization (WHO): International Statistical Classification of Diseases and Related Health Problems, 10th Revision (ICD-10). Geneva: WHO.
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