1. ICD-10-CM Codes
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2. E00-E89 Endocrine, nutritional and metabolic diseases
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3. E00-E07 Disorders of thyroid gland
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4. E05- Thyrotoxicosis [hyperthyroidism]
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5. 2021 ICD-10-CM Diagnosis Code E05.9

2021 ICD-10-CM Diagnosis Code E05.9

Thyrotoxicosis, unspecified

2016 2017 2018 2019 2020 2021 Non-Billable/Non-Specific Code

• E05.9 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
• The 2021 edition of ICD-10-CM E05.9 became effective on October 1, 2020.
• This is the American ICD-10-CM version of E05.9 - other international versions of ICD-10 E05.9 may differ.

• A disorder characterized by excessive levels of thyroid hormone in the body. Common causes include an overactive thyroid gland or thyroid hormone overdose.
• A hypermetabolic syndrome caused by excess thyroid hormones which may come from endogenous or exogenous sources. The endogenous source of hormone may be thyroid hyperplasia; thyroid neoplasms; or hormone-producing extrathyroidal tissue. Thyrotoxicosis is characterized by nervousness; tachycardia; fatigue; weight loss; heat intolerance; and excessive sweating.
• A hypermetabolic syndrome caused by the elevation of thyroid hormone levels in the serum. Signs and symptoms include tachycardia, palpitations, tremor, weight loss, warm weather intolerance, and moist skin. Causes include graves disease, toxic nodular goiter, toxic thyroid nodule, and lymphocytic thyroiditis.
• Excessive functional activity of the thyroid gland.
• Hypersecretion of thyroid hormones from the thyroid gland. Elevated levels of thyroid hormones increase basal metabolic rate.
• Overactivity of the thyroid gland resulting in overproduction of thyroid hormone and increased metabolic rate. Causes include diffuse hyperplasia of the thyroid gland (graves' disease), single nodule in the thyroid gland, and thyroiditis. The symptoms are related to the increased metabolic rate and include weight loss, fatigue, heat intolerance, excessive sweating, diarrhea, tachycardia, insomnia, muscle weakness, and tremor.
• Too much thyroid hormone. Symptoms include weight loss, chest pain, cramps, diarrhea, and nervousness.

• 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

• Code First: I43
  ICD-10-CM Diagnosis Code I43

  Cardiomyopathy in diseases classified elsewhere

  2016 2017 2018 2019 2020 2021 Billable/Specific Code Manifestation Code

  Code First

  • underlying disease, such as:
  • amyloidosis (E85.-)
  • glycogen storage disease (E74.0)
  • gout (M10.0-)
  • thyrotoxicosis (E05.0-E05.9-)

  Type 1 Excludes

  • cardiomyopathy (in):
  • coxsackie (virus) (B33.24)
  • diphtheria (A36.81)
  • sarcoidosis (D86.85)
  • tuberculosis (A18.84)

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.