ICD-10 Code E04.0 – Nontoxic Diffuse Goiter (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E04.0 – Nontoxic diffuse goiter
What it is
Nontoxic diffuse goiter is a generalized enlargement of the thyroid gland without signs of excess thyroid hormone production. It describes a diffuse, noncancerous thyroid swelling rather than a nodular or toxic process.
Clinical signs
The thyroid may appear symmetrically enlarged on exam, and patients can have neck fullness or pressure symptoms. Clinical features vary; refer to documentation.
When to use this code
Use E04.0 when the record clearly documents diffuse thyroid enlargement that is not toxic and not described as multinodular. It fits cases where the clinician diagnoses nontoxic diffuse goiter as the primary thyroid finding. If the note only says “goiter” without further detail, check documentation before coding.
Do not use for
Do not use this code for toxic goiter, multinodular goiter, or thyroid enlargement with hyperthyroidism. Do not assume the diagnosis from imaging alone if the provider has not confirmed it.
Coding tip
Confirm that the provider documents both “diffuse” and “nontoxic” before assigning E04.0.