E21
ICD-10Non-billable categoryHyperparathyroidism and other disorders of parathyroid gland
Official ICD-10-CM descriptor (FY2026)
Hyperparathyroidism and other disorders of parathyroid gland
E21 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- adult osteomalacia (M83.-)
- ectopic hyperparathyroidism (E34.2)
- hungry bone syndrome (E83.81)
- infantile and juvenile osteomalacia (E55.0)
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- familial hypocalciuric hypercalcemia (E83.52)
More specific codes under E21
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.