1. E21 Hyperparathyroidism and other disorders of parathyroid gland


    • adult osteomalacia (M83.-)
    • ectopic hyperparathyroidism (E34.2)
    • hungry bone syndrome (E83.81)
    • infantile and juvenile osteomalacia (E55.0)


    • familial hypocalciuric hypercalcemia (E83.52)
    1. E21.0 Primary hyperparathyroidism

      Inclusion term(s):

      • Hyperplasia of parathyroid
      • Osteitis fibrosa cystica generalisata [von Recklinghausen's disease of bone]
    2. E21.1 Secondary hyperparathyroidism, not elsewhere classified

    3. E21.2 Other hyperparathyroidism

      Inclusion term(s):

      • Tertiary hyperparathyroidism
    4. E21.3 Hyperparathyroidism, unspecified

    5. E21.4 Other specified disorders of parathyroid gland

    6. E21.5 Disorder of parathyroid gland, unspecified

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.