ICD-10 Code E21.4 – Other specified disorders of parathyroid gland (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E21.4 – Other specified disorders of parathyroid gland
What it is
E21.4 identifies a parathyroid gland disorder that does not fit a more specific parathyroid diagnosis. Use it when the record clearly states another specified parathyroid condition and no better code applies.
Clinical signs
Clinical features vary; refer to documentation. Findings may reflect abnormal parathyroid function, such as calcium imbalance or related endocrine symptoms, but you should code only what is specifically documented.
When to use this code
Use this code when the provider documents a specified parathyroid disorder that is not primary hyperparathyroidism, hypoparathyroidism, or another more exact category. It is appropriate for uncommon parathyroid conditions recorded by name when the chart supports them. If the diagnosis is vague, check documentation for clarification.
Do not use for
Do not use E21.4 for common parathyroid disorders that have their own codes, including primary hyperparathyroidism or hypoparathyroidism. If the condition is unspecified or better described elsewhere, choose the more accurate code.
Coding tip
Code the exact documented parathyroid diagnosis first; use E21.4 only when no other parathyroid code is a better fit.