2025 ICD-10-CM Diagnosis Code E03.9

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Hypothyroidism, unspecified

  • E03.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2025 edition of ICD-10-CM E03.9 became effective on October 1, 2024.
  • This is the American ICD-10-CM version of E03.9 – other international versions of ICD-10 E03.9 may differ.

Applicable To

  • Myxedema NOS

The following code(s) above E03.9 contain annotation back-references

 that may be applicable to E03.9:

  • E00-E89  Endocrine, nutritional and metabolic diseases
  • E03  Other hypothyroidism

Approximate Synonyms

  • Acquired hypothyroidism
  • Cerebral degeneration due to hypothyroidism
  • Cerebral degeneration in hypothyroidism
  • Hypothyroid (low level of thyroid hormone) in childbirth
  • Hypothyroid (low thyroid) in pregnancy
  • Hypothyroidism
  • Hypothyroidism (low thyroid)
  • Hypothyroidism (low thyroid), acquired
  • Hypothyroidism in childbirth
  • Hypothyroidism in pregnancy
  • Hypothyroidism postpartum
  • Myxedema
  • Postpartum (after childbirth) hypothyroidism
  • Subclinical hypothyroidism

Clinical Information

  • A condition characterized by a dry, waxy type of swelling (edema) with abnormal deposits of mucopolysaccharides in the skin and other tissues. It is caused by a deficiency of thyroid hormones. The skin becomes puffy around the eyes and on the cheeks. The face is dull and expressionless with thickened nose and lips.
  • A condition in which the production of thyroid hormone by the thyroid gland is diminished. Signs and symptoms of hypothyroidism include low metabolic rate, tendency to weight gain, somnolence and sometimes myxedema. In the United States, the most common cause of hypothyroidism is hashimoto’s thyroiditis, an autoimmune disorder.
  • A disorder characterized by a decrease in production of thyroid hormone by the thyroid gland.
  • A syndrome that results from abnormally low secretion of thyroid hormones from the thyroid gland, leading to a decrease in basal metabolic rate. In its most severe form, there is accumulation of mucopolysaccharides in the skin and edema, known as myxedema.
  • Condition characterized by a dry, waxy type of swelling with abnormal deposits of mucin in the skin and other tissues; it is produced by a functional insufficiency of the thyroid gland, resulting in deficiency of thyroid hormone.
  • Deficiency of thyroid gland activity; characterized by decreased basal metabolic rate, fatigue and lethargy, sensitivity to cold, and menstrual disturbances; untreated it progresses to myxedema; in infants severe hypothyroidism leads to cretinism.
  • Too little thyroid hormone. Symptoms include weight gain, constipation, dry skin, and sensitivity to the cold.

ICD-10-CM E03.9 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

  • 643 Endocrine disorders with mcc
  • 644 Endocrine disorders with cc
  • 645 Endocrine disorders without cc/mcc

Convert E03.9 to ICD-9-CMCode History

  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change
  • 2025 (effective 10/1/2024): No change

Code annotations containing back-references to E03.9:

Diagnosis Index entries containing back-references to E03.9:

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