ICD-10 Code E06.9 – Thyroiditis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E06.9 – Thyroiditis, unspecified
What it is
E06.9 identifies thyroid inflammation when the record does not specify the cause or type. Use it for a documented diagnosis of thyroiditis without further detail.
Clinical signs
Clinical features vary; refer to documentation. Thyroiditis may be associated with thyroid tenderness, neck discomfort, or changes in thyroid function, but the specific pattern is not stated here.
When to use this code
Use E06.9 when the clinician documents thyroiditis but does not name a subtype such as autoimmune, subacute, or drug-induced. It also fits when the chart confirms thyroid inflammation and no more specific diagnosis is available. Check documentation before defaulting to this code.
Do not use for
Do not use E06.9 if the record identifies a specific thyroiditis type or another thyroid disorder. Do not assign it for nonspecific thyroid symptoms without a documented diagnosis.
Coding tip
Query the provider when thyroiditis is mentioned but the subtype is unclear, because a more specific code may be available.