5A03

ICD-11 MMS 2026-01

Thyroiditis

Description

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.

Excludes

  • 5A00.2 – Acquired hypothyroidism
  • 5A02 – Thyrotoxicosis

Exclusions from above levels

  • 18 – Pregnancy, childbirth or the puerperium
  • http://id.who.int/icd/entity/1004987305 – Transitory endocrine or metabolic disorders specific to fetus or newborn

Child codes

  • 5A03.0 – Acute thyroiditis
  • 5A03.1 – Subacute thyroiditis
  • 5A03.2 – Autoimmune thyroiditis
  • 5A03.Y – Other specified thyroiditis
  • 5A03.Z – Thyroiditis, unspecified

Foundation children elsewhere

  • JB44.5 – Postpartum thyroiditis

Sibling codes

  • 5A00 – Hypothyroidism
  • 5A01 – Nontoxic goitre
  • 5A02 – Thyrotoxicosis
  • 5A04 – Hypersecretion of calcitonin
  • 5A05 – Generalised resistance to thyroid hormone
  • 5A06 – Sick-euthyroid syndrome
  • 5A0Y – Other specified disorders of the thyroid gland or thyroid hormones system
  • 5A0Z – Disorders of the thyroid gland or thyroid hormones system, unspecified

Foundation entity

Thyroiditis – http://id.who.int/icd/entity/587793334

Allowed postcoordination axes

Part of: 05: Endocrine, nutritional or metabolic diseases