ICD-10 Diagnosis Code E21.3

Hyperparathyroidism, unspecified

Diagnosis Code E21.3

ICD-10: E21.3
Short Description: Hyperparathyroidism, unspecified
Long Description: Hyperparathyroidism, unspecified
This is the 2017 version of the ICD-10-CM diagnosis code E21.3

Code Classification
  • Endocrine, nutritional and metabolic diseases
    • Disorders of other endocrine glands (E20-E35)
      • Hyperparathyroidism and other disorders of parathyroid gland (E21)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code E21.3 is grouped in the following Diagnostic Related Group(s) (MS-DRG v33.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.
  • 252.00 - Hyperparathyroidism NOS

  • Brown tumor of hyperparathyroidism
  • Calcifying panniculitis due to hyperparathyroidism
  • Endocrine myopathy
  • Hyperparathyroidism
  • Myopathy in hyperparathyroidism
  • Neonatal hyperparathyroidism
  • Subcutaneous calcification

Information for Patients

Parathyroid Disorders

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

  • Calcium - ionized
  • Calcium - urine
  • Calcium blood test
  • Hypercalcemia - discharge
  • Hyperparathyroidism
  • Hypoparathyroidism
  • Parathyroid adenoma
  • Parathyroid biopsy
  • Parathyroid cancer
  • Parathyroid gland removal
  • Parathyroid hormone (PTH) blood test

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