Other hyperparathyroidism

This code represents forms of hyperparathyroidism that are not primary, secondary, or tertiary. It encompasses various less common or atypical presentations of excessive parathyroid hormone secretion leading to hypercalcemia. This can include conditions like parathyroid carcinoma or ectopic parathyroid hormone production.

Use this code when documentation clearly indicates hyperparathyroidism that does not fit the criteria for primary (e.g., adenoma), secondary (e.g., chronic renal failure), or tertiary forms. This code is appropriate for cases where the underlying cause of parathyroid overactivity is unusual or specifically identified as "other." Documentation should specify the type of hyperparathyroidism if known, or clearly rule out primary, secondary, and tertiary causes.

• Ensure documentation explicitly states "other hyperparathyroidism" or provides sufficient detail to exclude primary, secondary, and tertiary forms.
• Review the Excludes1 note carefully; never code this alongside familial hypocalciuric hypercalcemia (E83.52).
• Always look for a more specific code if the type of hyperparathyroidism (e.g., primary, secondary, tertiary) is identified.