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D56.4 – Hereditary Persistence of Fetal Hemoglobin
D56.4 is the ICD-10 code for Hereditary Persistence of Fetal Hemoglobin (HPFH), a genetic blood disorder in which fetal hemoglobin remains elevated into adulthood.
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D56.4 is the ICD-10 code for Hereditary Persistence of Fetal Hemoglobin (HPFH), a genetic blood disorder in which fetal hemoglobin remains elevated into adulthood.
What is D56.4?
The ICD-10 code D56.4 refers to Hereditary Persistence of Fetal Hemoglobin (HPFH), a genetically inherited blood disorder belonging to the group of hemoglobinopathies – conditions in which the structure or function of hemoglobin, the red blood cell protein that carries oxygen, is altered.
Under normal circumstances, fetal hemoglobin (HbF), which predominates in the womb, is gradually replaced by adult hemoglobin (HbA) shortly after birth. In HPFH, this switch is incomplete, and HbF remains elevated throughout a person's life.
Causes and Genetics
HPFH is caused by mutations or deletions in the beta-globin gene cluster on chromosome 11. These genetic changes prevent the normal developmental switch from fetal to adult hemoglobin production.
- Deletional HPFH: Large segments of DNA within the beta-globin cluster are deleted.
- Non-deletional HPFH: Point mutations in the promoter regions of the gamma-globin genes prevent their silencing after birth.
HPFH is inherited in an autosomal pattern, meaning it affects males and females equally. Individuals may be heterozygous (one affected gene copy) or homozygous (both copies affected).
Symptoms and Clinical Course
In most cases, isolated HPFH is a benign condition with no clinical symptoms. Elevated HbF levels are often detected incidentally during routine blood tests. Because HbF has a higher oxygen affinity than HbA, it does not typically cause anemia or related symptoms.
HPFH becomes clinically relevant when it co-occurs with other hemoglobinopathies, such as:
- Sickle cell disease (HbS): HPFH can reduce disease severity, as HbF inhibits the sickling of red blood cells.
- Beta-thalassemia: Elevated HbF can partially compensate for the deficiency of HbA, reducing the severity of the condition.
Diagnosis
The diagnosis of D56.4 is established through several laboratory tests:
- Hemoglobin electrophoresis: Separates different types of hemoglobin to detect elevated HbF levels.
- HPLC (High-Performance Liquid Chromatography): Precisely quantifies hemoglobin fractions.
- Molecular genetic testing: Identifies specific deletions or mutations in the beta-globin cluster.
- Complete blood count (CBC): Usually normal or only mildly altered.
Treatment
Since isolated HPFH generally causes no symptoms, no specific treatment is required. Management is directed at any co-existing hemoglobinopathies.
HPFH is of great scientific interest as a therapeutic model: the artificial reactivation of fetal hemoglobin is a promising strategy for treating sickle cell disease and beta-thalassemia. Medications such as hydroxyurea, as well as emerging gene therapy approaches, aim to increase HbF production by mimicking the mechanism seen in HPFH.
Significance of the ICD-10 Code D56.4
The code D56.4 falls under the group D56 – Thalassemia in the ICD-10 classification system. It is used in clinical documentation, billing, and epidemiological research to uniquely identify hereditary persistence of fetal hemoglobin.
References
- World Health Organization (WHO) – International Classification of Diseases, 10th Revision (ICD-10), Code D56.4.
- Thein SL. – Hereditary Persistence of Fetal Hemoglobin. In: Steinberg MH et al. (eds.), Disorders of Hemoglobin. Cambridge University Press, 2nd edition, 2009.
- Forget BG. – Molecular Basis of Hereditary Persistence of Fetal Hemoglobin. Annals of the New York Academy of Sciences, 1998; 850: 38–44.
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