ICD-10-CM Book 2024 Edition

Chapters  /  Chapter 4  /  E20-E35  /  E21
E21 Hyperparathyroidism and other disorders of parathyroid gland
Excludes1 adult osteomalacia (M83.-)
ectopic hyperparathyroidism (E34.2)
hungry bone syndrome (E83.81)
infantile and juvenile osteomalacia (E55.0)
Excludes2 familial hypocalciuric hypercalcemia (E83.52)
E21.0 Primary hyperparathyroidism
Hyperplasia of parathyroid
Osteitis fibrosa cystica generalisata [von Recklinghausen's disease of bone]
E21.1 Secondary hyperparathyroidism, not elsewhere classified
Excludes1 secondary hyperparathyroidism of renal origin (N25.81)
E21.2 Other hyperparathyroidism
Tertiary hyperparathyroidism
Excludes1 familial hypocalciuric hypercalcemia (E83.52)
E21.3 Hyperparathyroidism, unspecified
E21.4 Other specified disorders of parathyroid gland
E21.5 Disorder of parathyroid gland, unspecified