ICD-10 Code E01.0 – Iodine-deficiency related diffuse (endemic) goiter (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E01.0 – Iodine-deficiency related diffuse (endemic) goiter
What it is
This code identifies a diffuse enlargement of the thyroid linked to iodine deficiency. It is used when the goiter is endemic and not described as nodular or toxic.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the thyroid is enlarged on exam without a clearly documented nodular pattern, and the record supports iodine deficiency as the cause.
When to use this code
Use E01.0 when the provider documents diffuse endemic goiter due to iodine deficiency. It fits cases where the enlargement is generalized and the diagnosis is not better classified as another thyroid disorder. If the note only says goiter, check documentation for the cause and type before coding.
Do not use for
Do not use this code for nodular goiter, toxic goiter, or goiter from other causes. If iodine deficiency is not documented, check documentation.
Coding tip
Verify both the diffuse pattern and the iodine-deficiency cause in the record before assigning E01.0.