Malignant neoplasm of parathyroid gland

This code identifies a primary cancerous tumor originating in the parathyroid glands. These glands, typically four in number and located in the neck, are responsible for regulating calcium levels in the blood. A malignant neoplasm signifies uncontrolled cell growth with the potential to invade surrounding tissues or metastasize.

Apply this code when documentation confirms a primary malignant tumor of the parathyroid gland, often diagnosed via biopsy and imaging studies. This diagnosis typically follows investigation of hypercalcemia or a palpable neck mass. Use this code for the initial diagnosis and subsequent treatment of the primary malignancy.

• Ensure documentation specifies "malignant" and "primary" to differentiate from benign tumors or secondary metastases.
• Do not confuse with codes for benign parathyroid adenomas (226) or secondary malignant neoplasms.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by codes for any associated symptoms or complications.