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ICD Hub / Endocrine, nutritional or metabolic diseases (E00–E89) / 5A00.2Y - Other specified acquired hypothyroidism
ICD-11

ICD-11 Codes
for 5A00.2Y - Other specified acquired hypothyroidism
Teodor Jurukovski January 1, 1970
Fact checked by: Teodor Jurukovski
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Exploring Synonyms for Acquired Hypothyroidism

Other terms that may be used in clinical contexts or documentation for acquired hypothyroidism include primary acquired hypothyroidism, hypothyroidism, primary or NOS, and autoimmune hypothyroidism. Specific syndromes or presentations sometimes associated with acquired hypothyroidism, as listed in classification systems, can include Débré-Sémélaigne syndrome, Hoffmann syndrome, hypothyroid myopathy, hypothyroid obesity, myxoedematous infantilism, and myxoedema myopathy. Consumptive hypothyroidism is another related term.

Understanding Other Specified Acquired Hypothyroidism (ICD-11 Code 5A00.2Y)

Acquired hypothyroidism is a medical condition where the thyroid gland does not produce sufficient thyroid hormones, and this deficiency develops after birth. The ICD-11 code 5A00.2Y, 'Other specified acquired hypothyroidism,' is used to classify specific instances of acquired hypothyroidism that do not fall under more precisely defined subcategories. This condition signifies a primary failure of the thyroid gland or other acquired causes that are specifically documented but not otherwise classified.

Factors Contributing to Acquired Hypothyroidism

Acquired hypothyroidism typically arises from primary gland failure, such as autoimmune thyroiditis (Hashimoto's thyroiditis), which is a common cause. It can also be iatrogenic, resulting from medical treatments like radiation therapy to the head and neck, thyroid surgery, or the use of certain medications. Other less common causes may include infiltrative diseases or severe iodine deficiency.

Recognising the Signs: Symptoms of Acquired Hypothyroidism

Symptoms of acquired hypothyroidism can vary widely and may include persistent fatigue, increased sensitivity to cold, dry skin, and unexplained weight gain. Other common indicators are constipation, a puffy face, and hoarseness. Some individuals may experience muscle weakness, joint stiffness, or thinning hair. Cognitive changes such as difficulty concentrating or memory impairment can also occur. In some cases, voice changes or a slowed heart rate may be noted.

How Acquired Hypothyroidism is Diagnosed

The diagnosis of acquired hypothyroidism is primarily established through blood tests. A key indicator is an elevated level of thyroid-stimulating hormone (TSH) in conjunction with low levels of free thyroxine (FT4). These results suggest that the thyroid gland is not producing enough hormones. Further testing, such as for thyroid peroxidase (TPO) antibodies, may be conducted to identify an autoimmune cause. Clinical signs and symptoms, while important for raising suspicion, are often nonspecific and require laboratory confirmation for a definitive diagnosis.

Treatment Approaches for Acquired Hypothyroidism

The cornerstone of managing acquired hypothyroidism is thyroid hormone replacement therapy, most commonly with levothyroxine. This medication works to restore normal thyroid hormone levels, alleviating symptoms and normalizing TSH levels. Dosing is typically initiated at a lower level for older patients or those with heart conditions and is adjusted based on regular monitoring of TSH levels. The goal is to achieve symptom relief and maintain TSH within the normal reference range. Treatment is generally lifelong.

Coding and Documentation for Other Specified Acquired Hypothyroidism (5A00.2Y)

For accurate billing and documentation, the ICD-11 code 5A00.2Y should be used for 'Other specified acquired hypothyroidism.' This code is reportable when a diagnosis of acquired hypothyroidism is made, and the specific details of the condition do not align with more narrowly defined ICD-11 categories for acquired hypothyroidism. Clinicians should ensure documentation clearly supports the diagnosis and the reason for using this 'other specified' code, detailing any specific causes or presentations identified.

Frequently asked questions

What is the ICD-11 classification meaning of 'Other specified acquired hypothyroidism' (5A00.2Y)?
This ICD-11 code represents acquired hypothyroidism, a condition where the thyroid gland produces insufficient thyroid hormone after birth, which is not classifiable to other more specific acquired hypothyroidism categories.
When is the ICD-11 code 5A00.2Y appropriate for coding acquired hypothyroidism?
The code 5A00.2Y is used when acquired hypothyroidism is documented and specific details are provided that do not align with other more specific acquired hypothyroidism codes within the ICD-11 classification.
How does ICD-11 distinguish between 'Other specified acquired hypothyroidism' (5A00.2Y) and 'Acquired hypothyroidism, unspecified' (5A00.2Z)?
'Other specified acquired hypothyroidism' (5A00.2Y) is used when there is some specific information about the acquired hypothyroidism that prevents it from being classified under more specific codes, but it is not fully unspecified. 'Acquired hypothyroidism, unspecified' (5A00.2Z) is used when there is insufficient information in the documentation to classify the acquired hypothyroidism further.
What does the term 'acquired' signify in the ICD-11 code 5A00.2Y, 'Other specified acquired hypothyroidism'?
In the context of ICD-11 code 5A00.2Y, 'acquired' indicates that the hypothyroidism developed after birth, distinguishing it from congenital forms of hypothyroidism.
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