E21 — Hyperparathyroidism and other disorders of parathyroid gland
Is E21 billable?
No — E21 is a non-billable header code. E21 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 6 billable codes beneath E21.
E21 at a glance
| Code | E21 |
|---|---|
| Description | Hyperparathyroidism and other disorders of parathyroid gland |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together
The conditions below can never be reported together with E21 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here
The conditions below are not part of E21, but a patient may have both at the same time. When documentation supports it, E21 and the excluded code may both be reported.
- familial hypocalciuric hypercalcemia (E83.52)
Excludes1 — never code together — inherited from Chapter 4
The conditions below can never be reported together with E21 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- transitory endocrine and metabolic disorders specific to newborn (P70-P74)
Excludes1 — never code together — inherited from E20-E35
The conditions below can never be reported together with E21 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
What codes fall under E21? (6)
How long has E21 existed?
E21 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with E21?
ICD-10-CM declares these codes mutually exclusive with E21 — exactly one of each pair can be correct for a given encounter.