ICD-10 Code E01 – Iodine-deficiency related thyroid disorders and allied conditions (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E01 – Iodine-deficiency related thyroid disorders and allied conditions
What it is
E01 identifies thyroid disorders caused by iodine deficiency, including goiter and related conditions. Use it when the record links the thyroid problem to inadequate iodine intake.
Clinical signs
Common findings include an enlarged thyroid, neck fullness, or other features of iodine-deficiency thyroid disease. Clinical features vary; refer to documentation.
When to use this code
Use E01 when the provider documents iodine-deficiency related thyroid disorder, endemic goiter, or a similar diagnosis tied to iodine lack. It fits cases where the etiology is stated or clearly supported in the record. If the note only says goiter without cause, check documentation.
Do not use for
Do not use E01 for thyroid disorders with another documented cause, such as autoimmune disease or nodules. Do not assume iodine deficiency without provider support.
Coding tip
Code E01 only when iodine deficiency is documented or clearly established in the chart.