ICD-10 Code E20.819 – Hypoparathyroidism due to impaired parathyroid hormone secretion, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E20.819 – Hypoparathyroidism due to impaired parathyroid hormone secretion, unspecified
What it is
This code identifies hypoparathyroidism caused by reduced parathyroid hormone secretion when the specific cause is not documented. Use it when the chart confirms low parathyroid function but does not specify the underlying reason.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include symptoms consistent with low calcium from impaired parathyroid hormone production, such as muscle cramps, tingling, or tetany, when documented by the clinician.
When to use this code
Use this code when the provider diagnoses hypoparathyroidism due to impaired hormone secretion and does not name a more specific cause. It also fits cases where the record supports parathyroid underfunction, but the etiology remains unspecified. Check documentation if the note mentions surgery, genetic disease, or another defined cause.
Do not use for
Do not use this code if the documentation identifies a different type of hypoparathyroidism or a more specific etiology. Do not assign it when the record only shows abnormal calcium results without a confirmed diagnosis.
Coding tip
Query for the exact cause whenever the note says “hypoparathyroidism” without detail, because a more specific ICD-10-CM code may apply.