Disorders Of The Thyroid Gland Or Thyroid Hormones System – Definitions & ICD 11 Codes


Definition of Disorders Of The Thyroid Gland Or Thyroid Hormones System: Disorders due to dysfunction of thyroid gland and regulation systems of thyroid hormone actions including dysfunction of the pituitary, hypothalamus, or thyroid hormone receptors.

Hypothyroidism

ICD 11 Code For Hypothyroidism

  5A00  Hypothyroidism


5A00.0 Congenital hypothyroidism

Definition of Congenital hypothyroidism: Hypothyroidism is a condition where the thyroid gland produces too little or no thyroid hormone, and the condition arises at birth. Common clinical features include decreased activity and increased sleep, feeding difficulty and constipation, prolonged jaundice, myxedematous facies, large fontanels (especially posterior), macroglossia, a distended abdomen with umbilical hernia, and hypotonia.

Coded Elsewhere:

5A00.00 Permanent congenital hypothyroidism with diffuse goitre

Definition of Permanent congenital hypothyroidism with diffuse goitre: A condition caused by a partial or complete loss of thyroid function due to failure of the thyroid to correctly develop during the antenatal period. This condition is characterised by a swollen, smooth thyroid gland, and in infants by a dull look, puffy face, and thick tongue that sticks out. This condition may also present with choking episodes, constipation, dry brittle hair, jaundice, lack of muscle tone, low hairline, poor feeding, short height, sleepiness, or sluggishness.

Exclusions:

  • transitory congenital goitre with normal function (KB62)

5A00.01 Permanent congenital hypothyroidism without goitre

Definition of Permanent congenital hypothyroidism without goitre: This is a permanent congenital state in which the thyroid gland does not make enough thyroid hormone. This diagnosis is without swelling of the thyroid gland.

5A00.02 Pendred syndrome

Definition of Pendred syndrome: Pendred syndrome is characterised by the association of congenital bilateral neurosensory deafness, thyroid goitre, cochleovestibular malformation and potential vestibular dysfunction.

5A00.03 Transient congenital hypothyroidism

Definition of Transient congenital hypothyroidism: Transient congenital hypothyroidism is defined as transient thyroid dysfunction with mildly elevated thyroid-stimulating hormone (TSH) and low thyroxine (FT4) levels which return to normal either very promptly and spontaneously, or after several months of thyroxine therapy. The disorder is due to a variety of causes including iodine deficiency or exposure to iodine-containing compounds, transplacental passage of blocking maternal antibodies, and dyshormonogenesis.

Exclusions:

  • Transitory congenital goitre with normal function (KB62)

5A00.04 Congenital hypothyroidism due to iodine deficiency

Definition of Congenital hypothyroidism due to iodine deficiency: Hypothyroidism is a condition which arises at birth where the thyroid gland produces too little or no thyroid hormone and it can be induced by iodine-deficiency.

Exclusions:

  • Subclinical iodine-deficiency hypothyroidism (5A00.22)

5A00.0Y Other specified congenital hypothyroidism

5A00.0Z Congenital hypothyroidism unspecified

5A00.1 Iodine-deficiency-related thyroid disorders or allied conditions

Definition of Iodine-deficiency-related thyroid disorders or allied conditions: Any condition caused by aberrant thyroid function due to a deficiency of iodine. Confirmation is by blood test.

Exclusions:

  • congenital iodine-deficiency syndrome (5A00.04)
  • Subclinical iodine-deficiency hypothyroidism (5A00.22)

5A00.10 Iodine-deficiency-related diffuse goitre

Definition of Iodine-deficiency-related diffuse goitre: Diffuse enlargement of the thyroid gland due to Iodine-deficiency

5A00.11 Iodine-deficiency-related multinodular goitre

Definition of Iodine-deficiency-related multinodular goitre: Multinodular enlargement of the thyroid gland due to Iodine-deficiency

Inclusions:

  • Iodine-deficiency-related nodular goitre

5A00.1Z Iodine-deficiency-related thyroid disorders or allied conditions unspecified

5A00.2 Acquired hypothyroidism

Definition of Acquired hypothyroidism: Acquired hypothyroidism is a condition where the thyroid gland produces too little or no thyroid hormone, and the condition arises only after birth.

Exclusions:

Coded Elsewhere:

5A00.20 Hypothyroidism due to medicaments or other exogenous substances

Definition of Hypothyroidism due to medicaments or other exogenous substances: A condition caused by an underactive thyroid due to a medicaments or other exogenous substances. This condition may present with fatigue, increased sensitivity to cold, constipation, dry skin, weight gain, muscle weakness, elevated blood cholesterol, muscle aches, joint pain or swelling, heavier or irregular menstrual periods, thinning hair, depression, or impaired memory.

5A00.21 Myxoedema coma

Definition of Myxoedema coma: A life-threatening hypothyroid condition with long-standing severe untreated hypothyroidism in whom adaptive mechanisms fail to maintain homeostasis.

5A00.22 Subclinical iodine-deficiency hypothyroidism

Definition of Subclinical iodine-deficiency hypothyroidism: A condition with elevated serum TSH level, but with normal thyroid hormone levels, which is induced by iodine-deficiency

5A00.2Y Other specified acquired hypothyroidism

5A00.2Z Acquired hypothyroidism unspecified

5A00.Z Hypothyroidism unspecified

Nontoxic goitre

Definition of Nontoxic goitre: Enlargement of the thyroid gland due to follicular multiplication, unaccompanied by hyperthyroidism or thyrotoxicosis

ICD 11 Code For Nontoxic goitre

  5A01  Nontoxic goitre

Exclusions:

  • congenital goitre NOS (5A00.00)
  • congenital parenchymatous goitre (5A00.00)
  • iodine-deficiency-related goitre (5A00.1)
  • congenital diffuse goitre (5A00.00)

5A01.0 Nontoxic diffuse goitre

Definition of Nontoxic diffuse goitre: Diffuse enlargement of the thyroid gland due to follicular multiplication, unaccompanied by hyperthyroidism or thyrotoxicosis

5A01.1 Nontoxic single thyroid nodule

Definition of Nontoxic single thyroid nodule: Single tumour of the thyroid gland due to follicular multiplication, unaccompanied by hyperthyroidism or thyrotoxicosis

5A01.2 Nontoxic multinodular goitre

Definition of Nontoxic multinodular goitre: Multiple nodules of the thyroid gland due to follicular multiplication, unaccompanied by hyperthyroidism or thyrotoxicosis

5A01.Z Nontoxic goitre unspecified

Thyrotoxicosis

Definition of Thyrotoxicosis: A hypermetabolic condition associated with elevated levels of free thyroxine and/or free triiodothyronine resulting in excess synthesis and secretion of thyroid hormone

ICD 11 Code For Thyrotoxicosis

  5A02  Thyrotoxicosis

Exclusions:

  • neonatal thyrotoxicosis (KB62.0)

Coded Elsewhere:

  • Dysthyroid exophthalmos (9A20.00)

5A02.0 Thyrotoxicosis with diffuse goitre

Definition of Thyrotoxicosis with diffuse goitre: Thyrotoxicosis occurs by the ingestion of excessive amounts of exogenous thyroid hormone in the form of thyroid hormone supplements such as the most widely used supplement levothyroxine.

Inclusions:

  • Toxic diffuse goitre
  • Graves disease

5A02.1 Thyrotoxicosis with toxic single thyroid nodule

Inclusions:

  • Thyrotoxicosis with toxic uninodular goitre

5A02.2 Thyrotoxicosis with toxic multinodular goitre

Definition of Thyrotoxicosis with toxic multinodular goitre: Thyrotoxicosis caused by functioning thyroid multinodules

5A02.3 Thyrotoxicosis from ectopic thyroid tissue

5A02.4 Thyrotoxicosis factitia

Definition of Thyrotoxicosis factitia: A condition of thyrotoxicosis caused by the ingestion of exogenous thyroid hormone

5A02.5 Thyroid crisis

Definition of Thyroid crisis: Thyrotoxic crisis (or thyroid storm) is a rare but severe complication of hyperthyroidism, which may occur when a thyrotoxic patient becomes very sick or physically stressed.

Inclusions:

  • Thyroid storm

5A02.6 Secondary hyperthyroidism

Definition of Secondary hyperthyroidism: Overproduction of thyroid hormone in the thyroid gland induced by dysfunction of the pituitary gland or hypothalamus.

Coding Note:

  • Code also the causing condition

5A02.Y Other specified thyrotoxicosis

5A02.Z Thyrotoxicosis unspecified

Thyroiditis

Definition of Thyroiditis: Thyroiditis is the inflammation of the thyroid gland. It includes acute and chronic forms of thyroiditis. Thyroiditis is usually caused by autoimmune reaction to the thyroid, resulting in inflammation and damage to the thyroid cells. The symptoms include fatigue, weight gain, depression, dry skin, and constipation.

ICD 11 Code For Thyroiditis

  5A03  Thyroiditis

Exclusions:

  • Acquired hypothyroidism (5A00.2)
  • Thyrotoxicosis (5A02)

Coded Elsewhere:

  • Postpartum thyroiditis (JB44.5)

5A03.0 Acute thyroiditis

Definition of Acute thyroiditis: Acute thyroiditis is a rare form of thyroiditis directly caused by an infection, frequently bacterial.

5A03.1 Subacute thyroiditis

Definition of Subacute thyroiditis: A self-limited thyroiditis associated with a triphasic clinical course of hyperthyroidism, hypothyroidism, and return to normal thyroid function. It is thought to be caused by a viral infection.

Inclusions:

  • de Quervain thyroiditis
  • giant-cell thyroiditis
  • granulomatous thyroiditis

Exclusions:

  • Autoimmune thyroiditis (5A03.2)

5A03.2 Autoimmune thyroiditis

Definition of Autoimmune thyroiditis: A chronic inflammatory disorder of the thyroid gland associated with abnormal circulatory antibodies.

5A03.20 Hashimoto thyroiditis

5A03.21 Painless thyroiditis

Definition of Painless thyroiditis: A destructive thyroiditis which has an autoimmune basis in the non-postpartum period. An inflammation of the thyroid gland characterised by transient hyperthyroidism, followed by hypothyroidism and then recovery.

5A03.2Y Other specified autoimmune thyroiditis

5A03.Y Other specified thyroiditis

5A03.Z Thyroiditis unspecified

Hypersecretion of calcitonin

Definition of Hypersecretion of calcitonin: This is the process of elaborating, releasing, and oozing a 32-amino acid linear polypeptide hormone that is produced in humans primarily by the parafollicular cells (also known as C-cells) of the thyroid, and in many other animals in the ultimobranchial body.

ICD 11 Code For Hypersecretion of calcitonin

  5A04  Hypersecretion of calcitonin

Inclusions:

  • Hypersecretion of thyrocalcitonin
  • C-cell hyperplasia of thyroid

Generalised resistance to thyroid hormone

Definition of Generalised resistance to thyroid hormone: Decreased thyroid hormone action, generally induced by mutation of thyroid hormone receptors.

ICD 11 Code For Generalised resistance to thyroid hormone

  5A05  Generalised resistance to thyroid hormone

Sick-euthyroid syndrome

ICD 11 Code For Sick-euthyroid syndrome

  5A06  Sick-euthyroid syndrome

Other specified disorders of the thyroid gland or thyroid hormones system

ICD 11 Code For Other specified disorders of the thyroid gland or thyroid hormones system

  5A0Y  Other specified disorders of the thyroid gland or thyroid hormones system

Disorders of the thyroid gland or thyroid hormones system unspecified

ICD 11 Code For Disorders of the thyroid gland or thyroid hormones system unspecified

  5A0Z  Disorders of the thyroid gland or thyroid hormones system unspecified

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