Hyperparathyroidism
Also known as: Disorders of the parathyroids or parathyroid hormone system, unspecified
General information only. Anpheros does not diagnose and does not recommend treatment. Talk to a doctor or pharmacist about your situation. In an emergency, call 112 (or your local emergency number).
In short
The parathyroid glands are four pea-sized glands in the neck that make parathyroid hormone, which helps the body keep the right balance of calcium and phosphorous. If these glands secrete extra parathyroid hormone, the condition is hyperparathyroidism, which rises blood calcium and is often caused by a benign tumor, enlarged glands, or, very rarely, cancer. If the glands do not make enough parathyroid hormone, the condition is hypoparathyroidism, which results in too little calcium and too much phosphorous in the blood. Causes of hypoparathyroidism include injury to the glands, endocrine disorders, or genetic conditions, and treatment is aimed at restoring the balance of calcium and phosphorous.
Source: MedlinePlus, National Library of Medicine.
AI-generated summary of the sources cited on this page, checked automatically against them. Not reviewed by a clinician; not medical advice.
Codes
Description
Most people have four pea-sized glands, called parathyroid glands, on the thyroid gland in the neck. Though their names are similar, the thyroid and parathyroid glands are completely different. The parathyroid glands make parathyroid hormone (PTH), which helps your body keep the right balance of calcium and phosphorous.
If your parathyroid glands make too much or too little hormone, it disrupts this balance. If they secrete extra PTH, you have hyperparathyroidism, and your blood calcium rises. In many cases, a benign tumor on a parathyroid gland makes it overactive. Or, the extra hormones can come from enlarged parathyroid glands. Very rarely, the cause is cancer.
If you do not have enough PTH, you have hypoparathyroidism. Your blood will have too little calcium and too much phosphorous. Causes include injury to the glands, endocrine disorders, or genetic conditions. Treatment is aimed at restoring the balance of calcium and phosphorous.
NIH: National Institute of Diabetes and Digestive and Kidney Diseases
Next to it in ICD-10
- E15Hypoglycaemic coma (not due to diabetes)
- E16Low blood sugar and other pancreatic hormone disorders
- E20Hypoparathyroidism, unspecified
- E22Overactive pituitary gland
- E23Underactive pituitary gland
- E24Cushing syndrome, unspecified
Neighbouring codes in the classification, not a medical link.
External resources
Questions
What is the ICD-10 code for Hyperparathyroidism?
E21 (WHO, International Classification of Diseases, 10th Revision).
What is the ICD-11 code for Hyperparathyroidism?
5A5Z: Disorders of the parathyroids or parathyroid hormone system, unspecified (WHO, ICD-11 for Mortality and Morbidity Statistics).
Sources and attribution
- ICD-11 for Mortality and Morbidity Statistics, © World Health Organization, licensed under CC BY-ND 3.0 IGO.
- Names other than the official source titles: Anpheros translations and plain-language names, made with AI assistance and checked automatically; the source names are in English.
- Source: MedlinePlus, National Library of Medicine.
- ICD-10 codes and titles © World Health Organization. Source: WHO, International Classification of Diseases, 10th Revision (2019).
Anpheros Search catalog 2026.10.5, published 17 October 2026. About the data →
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