ICD-10-CM · Chapter 4 · E00-E89
E21 Hyperparathyroidism and other disorders of parathyroid gland
Excludes 1 (cannot be coded together)
- adult osteomalacia (M83.-)
- ectopic hyperparathyroidism (E34.2)
- hungry bone syndrome (E83.81)
- infantile and juvenile osteomalacia (E55.0)
Excludes 2 (not included here)
- familial hypocalciuric hypercalcemia (E83.52)
Subcodes
Each subcode links to a detail page with full clinical annotations.
| Code | Description | Billable |
|---|---|---|
| E21..0 | Primary hyperparathyroidism | Yes |
| E21..1 | Secondary hyperparathyroidism, not elsewhere classified | Yes |
| E21..2 | Other hyperparathyroidism | Yes |
| E21..3 | Hyperparathyroidism, unspecified | Yes |
| E21..4 | Other specified disorders of parathyroid gland | Yes |
| E21..5 | Disorder of parathyroid gland, unspecified | Yes |
Last reviewed: September 2026