ICD-10 Code E21.2 – Other hyperparathyroidism (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E21.2 – Other hyperparathyroidism
What it is
E21.2 identifies hyperparathyroidism that does not fit the primary or secondary categories. Use it for parathyroid overactivity documented as “other” or otherwise specified by the provider.
Clinical signs
Clinical features vary; refer to documentation. Patients may have signs of excess parathyroid hormone activity, but the record should clearly support the specific “other” hyperparathyroidism diagnosis.
When to use this code
Use E21.2 when the clinician documents hyperparathyroidism and specifies that it is not primary or secondary, or when the condition is described as another named form of hyperparathyroidism. Code it only when the chart supports that classification. If the documentation is unclear, check documentation before assigning the code.
Do not use for
Do not use this code for primary hyperparathyroidism, secondary hyperparathyroidism, or cases where the provider has not identified the type. Avoid using it as a default when the documentation is incomplete.
Coding tip
Match the code to the provider’s exact wording and confirm that “other” hyperparathyroidism is explicitly documented.