ICD-10 Code E05.30 – Thyrotoxicosis from ectopic thyroid tissue without thyrotoxic crisis or storm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E05.30 – Thyrotoxicosis from ectopic thyroid tissue without thyrotoxic crisis or storm
What it is
This code identifies thyrotoxicosis caused by thyroid tissue located outside the normal thyroid gland. It applies when the excess thyroid hormone effect is present, but there is no thyrotoxic crisis or storm.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include signs of hyperthyroidism such as weight loss, palpitations, tremor, heat intolerance, or a visible or palpable ectopic thyroid mass.
When to use this code
Use this code when the provider documents thyrotoxicosis specifically due to ectopic thyroid tissue, such as lingual thyroid or other ectopic thyroid remnants. It is appropriate when the record confirms thyrotoxicosis but does not describe crisis or storm. Check documentation if the site or cause is unclear.
Do not use for
Do not use this code for thyrotoxicosis from the normal thyroid gland, thyroiditis, or Graves disease unless the record specifically states ectopic thyroid tissue. Do not use it when thyrotoxic crisis or storm is documented instead.
Coding tip
Code the ectopic source exactly as documented and verify that no crisis or storm is present.