ICD-10 Code E07.0 – Hypersecretion of calcitonin (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E07.0 – Hypersecretion of calcitonin
What it is
E07.0 identifies excess calcitonin production, usually from the thyroid’s C cells. Use it when documentation states hypersecretion of calcitonin, not just a thyroid nodule or cancer suspicion.
Clinical signs
Clinical features vary; refer to documentation. Calcitonin excess is often recognized by elevated calcitonin testing and may be associated with medullary thyroid disease or other endocrine findings.
When to use this code
Use this code when the clinician documents hypersecretion of calcitonin as the diagnosis or reason for evaluation. It may appear in endocrine workups, thyroid assessments, or follow-up notes where excess calcitonin is specifically stated.
If the record only mentions abnormal thyroid labs, a thyroid mass, or possible medullary carcinoma, check documentation before assigning E07.0. Code the documented condition that best explains the encounter.
Do not use for
Do not use E07.0 for general thyroid disorders, nonspecific endocrine abnormalities, or thyroid cancer without documented calcitonin hypersecretion. Check documentation if the chart does not clearly state this diagnosis.
Coding tip
Assign E07.0 only when the provider explicitly links the encounter to hypersecretion of calcitonin.