ICD-10 Code E05.01 – Thyrotoxicosis with diffuse goiter with thyrotoxic crisis or storm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E05.01 – Thyrotoxicosis with diffuse goiter with thyrotoxic crisis or storm
What it is
This code identifies severe thyrotoxicosis caused by diffuse goiter, also called thyroid storm or crisis. It reflects an acute, life-threatening worsening of hyperthyroidism, not simple overactive thyroid disease.
Clinical signs
Typical findings include marked hypermetabolic symptoms with diffuse thyroid enlargement and acute systemic illness. Clinical features vary; refer to documentation for evidence of crisis, such as severe agitation, confusion, or cardiovascular instability.
When to use this code
Use E05.01 when the record clearly documents thyrotoxicosis with diffuse goiter and a thyrotoxic crisis or storm. Apply it for inpatient or emergency encounters where the provider states thyroid storm, crisis, or equivalent wording.
Do not assign it for uncomplicated Graves’ disease or diffuse goiter without crisis. If the note only says hyperthyroidism or thyrotoxicosis, check documentation for the specific storm diagnosis before coding.
Do not use for
Do not use this code for diffuse goiter without thyrotoxic crisis, or for other forms of thyrotoxicosis without storm. Check documentation if the thyroid condition is unspecified or the crisis component is not stated.
Coding tip
Capture both elements: diffuse goiter and thyrotoxic crisis; missing either detail may point you to a different code.