5A51.1

ICD-11 MMS 2026-01

Secondary hyperparathyroidism

Description

Secondary hyperparathyroidism is a condition with enhanced parathyroid hormone (PTH) secretion and high circulatory PTH level caused by metabolic changes such as hypocalcaemia, hyperphosphataemia and low 1,25-dihydroxyvitamin D.

Index terms

  • Secondary hyperparathyroidism
  • secondary hyperparathyroidism NEC
  • Hyperparathyroid osteodystrophy

Excludes

  • GB90.4Z – secondary hyperparathyroidism of renal origin

Exclusions from above levels

  • 5B57.0 – infantile and juvenile osteomalacia
  • FB83.2 – Adult osteomalacia
  • 5B57 – Hypovitaminosis D
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  • 5C54.1 – Hyperphosphataemic familial tumoural calcinosis
  • 5C63.20 – Hypocalcaemic vitamin D dependent rickets
  • 5C63.21 – Hypocalcaemic vitamin D resistant rickets
  • 18 – Pregnancy, childbirth or the puerperium
  • http://id.who.int/icd/entity/1004987305 – Transitory endocrine or metabolic disorders specific to fetus or newborn

Sibling codes

  • 5A51.0 – Primary hyperparathyroidism
  • 5A51.2 – Familial hypocalciuric hypercalcaemia
  • 5A51.Y – Other specified hyperparathyroidism
  • 5A51.Z – Hyperparathyroidism, unspecified

Foundation entity

Secondary hyperparathyroidism – http://id.who.int/icd/entity/1442752937

Allowed postcoordination axes

Part of: 5A51: Hyperparathyroidism › 05: Endocrine, nutritional or metabolic diseases