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D64.9 – Anaemia Unspecified | ICD-10 Code
D64.9 is the ICD-10 code for unspecified anaemia, a condition where haemoglobin levels in the blood are below normal without a more specific cause being documented.
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D64.9 is the ICD-10 code for unspecified anaemia, a condition where haemoglobin levels in the blood are below normal without a more specific cause being documented.
What does the ICD-10 code D64.9 mean?
The ICD-10 code D64.9 stands for anaemia, unspecified. This diagnostic code is used when a patient has been found to have anaemia but the specific type or underlying cause has not been further defined or coded. It belongs to the category of other anaemias (ICD-10 block D64) within the chapter on diseases of the blood and blood-forming organs.
What is anaemia?
Anaemia occurs when the concentration of haemoglobin -- the red oxygen-carrying protein in the blood -- falls below the reference value for a person of a given sex and age. The World Health Organization (WHO) defines anaemia in adults as a haemoglobin level below 13.0 g/dl in men and below 12.0 g/dl in women. Anaemia is not a disease in itself, but rather a sign or symptom of an underlying condition.
Causes
The possible causes of anaemia are diverse. Common causes include:
- Nutritional deficiencies: lack of iron, vitamin B12, or folate
- Chronic diseases: kidney failure, malignancies, chronic inflammatory conditions
- Blood loss: acute or chronic bleeding (e.g. from peptic ulcers or heavy menstruation)
- Impaired red blood cell production: bone marrow disorders, aplastic anaemia
- Increased destruction of red blood cells: haemolytic anaemias
- Genetic causes: e.g. sickle cell disease or thalassaemia
When no specific cause is documented or identified, the code D64.9 is applied.
Symptoms
Symptoms depend on the severity of anaemia and how quickly it develops. Typical symptoms include:
- Fatigue and general weakness
- Pale skin and mucous membranes
- Shortness of breath and increased heart rate (palpitations)
- Dizziness and headaches
- Difficulty concentrating
- Sensitivity to cold, especially in the hands and feet
Diagnosis
Anaemia is typically diagnosed through a full blood count. The following values are measured:
- Haemoglobin concentration (Hb)
- Haematocrit (proportion of red blood cells in total blood volume)
- Erythrocyte count (number of red blood cells)
- MCV (mean corpuscular volume) to classify the type of anaemia
To identify the underlying cause, further laboratory tests (e.g. ferritin, vitamin B12, reticulocyte count) and additional diagnostic investigations may be required.
Treatment
Treatment depends on the underlying cause of the anaemia:
- Iron deficiency anaemia: iron supplementation, orally or intravenously
- Vitamin B12 deficiency: vitamin B12 supplementation (oral or by injection)
- Folate deficiency: folic acid supplementation
- Anaemia of chronic disease: treatment of the underlying condition, possibly erythropoietin therapy
- Severe anaemia: blood transfusion when clinically indicated
In clinical practice, the code D64.9 should be replaced by a more specific diagnosis whenever possible to ensure optimal patient management and treatment.
References
- World Health Organization (WHO): Haemoglobin concentrations for the diagnosis of anaemia and assessment of severity. WHO/NMH/NHD/MNM/11.1, Geneva, 2011.
- Kasper, D.L. et al.: Harrison's Principles of Internal Medicine. 21st edition. McGraw-Hill Education, New York, 2022.
- World Health Organization (WHO): ICD-10: International Statistical Classification of Diseases and Related Health Problems, 10th Revision. Geneva: WHO, 2019.
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