ICD-10 Code E01.1 – Iodine-deficiency related multinodular (endemic) goiter (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E01.1 – Iodine-deficiency related multinodular (endemic) goiter
What it is
This code identifies a multinodular goiter caused by iodine deficiency and occurring in an endemic setting. Use it when the enlarged thyroid is specifically documented as iodine-deficiency related.
Clinical signs
Typical documentation includes an enlarged, nodular thyroid, often in a region with low iodine intake. Clinical features vary; refer to documentation for compressive symptoms or imaging findings.
When to use this code
Use E01.1 when the provider clearly links the multinodular goiter to iodine deficiency and describes it as endemic or iodine-deficiency related. It may be supported by assessment notes, imaging, or problem lists that name the condition directly.
Do not infer iodine deficiency from goiter alone. If the record only says multinodular goiter, check documentation for a more specific thyroid code.
Do not use for
Do not use this code for goiter without documented iodine deficiency, or for other thyroid nodules and nodular thyroid disease. Check documentation if the cause is unclear.
Coding tip
Assign E01.1 only when both multinodular goiter and iodine deficiency are documented together.