ICD-10 Code E20.9 – Hypoparathyroidism, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E20.9 – Hypoparathyroidism, unspecified
What it is
E20.9 identifies hypoparathyroidism when the record does not specify the cause or type. Use it for reduced parathyroid function documented without further detail.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include signs of low calcium related to hypoparathyroidism, but you should not infer details that are not recorded.
When to use this code
Use E20.9 when the clinician documents hypoparathyroidism but does not identify whether it is postsurgical, congenital, or another specified form. It also fits when the note confirms the diagnosis and no additional detail is available. If the cause is stated elsewhere, code the more specific diagnosis instead.
Do not use for
Do not use this code for documented hypoparathyroidism with a known cause or subtype, such as postsurgical disease. Also avoid it when the chart only mentions abnormal calcium or parathyroid testing without a diagnosis. Check documentation.
Coding tip
Query for etiology or subtype before assigning E20.9, because a more specific code may be available.