E21 — Hyperparathyroidism and other disorders of parathyroid gland
E21 is a non-billable header ICD-10-CM code for hyperparathyroidism and other disorders of parathyroid gland. It cannot be billed on its own: choose one of the more specific child codes below.
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
- familial hypocalciuric hypercalcemia (E83.52)
Other codes that can never be billed with E21
These codes carry an Excludes1 note pointing at E21. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading E21 alone.
Risk adjustment
E21 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead E21
6 child codes. Green means billable.
Questions about E21
- Is E21 a billable ICD-10-CM code?
- No. E21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does E21 sit in the tabular list?
- Endocrine, nutritional and metabolic diseases (E00-E89), in the block Disorders of other endocrine glands (E20-E35).
- What cannot be coded together with E21?
- E21 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.