GB56.4

ICD-11 MMS 2026-01

Other or unspecified hydronephrosis

Description

This refers to distension and dilation of the renal pelvis and calyces in situations other than those coded elsewhere or when no additional details are available.

Index terms

  • Other or unspecified hydronephrosis
  • hydronephrosis NOS
  • Calyx dilatation
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  • Hydrocalycosis, not otherwise specified
  • Hydronephrotic kidney atrophy
  • Hydroureteronephrosis
  • Pyelectasis
  • Pyelogenic cyst of kidney
  • Uronephrosis

Excludes

  • GB58 – Pyonephrosis

Exclusions from above levels

  • GB55 – Obstructive pyelonephritis
  • http://id.who.int/icd/entity/1746821938 – Calculus of kidney and ureter without hydronephrosis
  • 4A43.2Y – Sjögren syndrome with renal tubulo-interstitial disorders
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  • 4B22 – Renal tubulo-interstitial disorders in simple cryoglobulinaemia
  • 5C60.1 – Renal tubulo-interstitial disorders in cystinosis
  • GB82 – Autosomal dominant tubulointerstitial disease
  • GB90.Y – pyeloureteritis cystica
  • 01 – Certain infectious or parasitic diseases
  • 05 – Endocrine, nutritional or metabolic diseases
  • 18 – Complications of pregnancy, childbirth and the puerperium
  • 22 – Injury, poisoning or certain other consequences of external causes

Sibling codes

  • GB56.0 – Hydronephrosis with ureteropelvic junction obstruction
  • GB56.1 – Hydronephrosis with ureteral obstruction
  • GB56.2 – Hydronephrosis with ureteral orifice obstruction
  • GB56.3 – Hydronephrosis due to bladder obstruction
  • GB56.5 – Hydronephrosis and reflux nephropathy with vesicoureteral or vesico-uretero-renal reflux
  • GB56.Y – Other specified obstructive or reflux nephropathy
  • GB56.Z – Obstructive or reflux nephropathy, unspecified

Foundation entity

Other or unspecified hydronephrosis – http://id.who.int/icd/entity/1379313682

Allowed postcoordination axes

Part of: GB56: Obstructive or reflux nephropathy › 16: Diseases of the genitourinary system