ICD-10 Code E03.8 – Other specified hypothyroidism (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E03.8 – Other specified hypothyroidism
What it is
E03.8 identifies hypothyroidism that is documented but does not fit a more specific ICD-10 category. It is used when the record names a particular cause or type not otherwise classified.
Clinical signs
Clinical features vary; refer to documentation. Common hypothyroid findings may include fatigue, cold intolerance, constipation, weight gain, and slowed mental or physical activity.
When to use this code
Use E03.8 when the provider documents hypothyroidism with a specified form that is not listed elsewhere in the hypothyroidism category. It may apply when the note clearly states an atypical or other specified cause. If the documentation is vague, check documentation before assigning this code.
Do not use for
Do not use this code for congenital hypothyroidism, subclinical hypothyroidism, or hypothyroidism due to thyroidectomy or other listed causes when a more specific code is available.
Coding tip
Choose the most specific hypothyroidism code supported by the provider’s wording, and query for clarification if the cause is not clearly documented.