Hypersecretion of calcitonin

This code signifies an excessive production and release of calcitonin by the parafollicular C-cells of the thyroid gland. This endocrine imbalance can lead to various metabolic disturbances, primarily affecting calcium regulation.

Use this code when diagnostic testing confirms elevated calcitonin levels, often in the context of suspected or diagnosed medullary thyroid carcinoma (MTC). Documentation should clearly indicate laboratory findings of hypercalcitoninemia and the clinical suspicion or diagnosis prompting the investigation.

• Always confirm elevated calcitonin levels through laboratory results documented in the patient's record.
• This code is often a secondary diagnosis, with the primary diagnosis typically being medullary thyroid carcinoma (C73).
• Do not use this code for transient or physiologically appropriate increases in calcitonin (e.g., during pregnancy) unless specifically documented as pathological hypersecretion.