GB51

ICD-11 MMS 2026-01

Acute pyelonephritis

Description

Acute inflammation of the renal pelvis and parenchyma due to bacterial infection. One of the commonest bacterial infections of adult women. Symptoms include fever, loin (kidney) pain, nausea and vomiting. Co-incident symptoms of acute cystitis with dysuria, frequency and haematuria may occur. Renal failure is not a feature unless there is septicaemia, hypotension or hypovolemia.

Index terms

  • Acute pyelonephritis
  • APN - [acute pyelonephritis]
  • Acute bacterial pyelonephritis
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  • Acute congenital pyelitis
  • Acute uraemic pyelitis

Inclusions

  • Acute bacterial pyelonephritis

Exclusions from above levels

  • 4A43.2Y – Sjögren syndrome with renal tubulo-interstitial disorders
  • 4B22 – Renal tubulo-interstitial disorders in simple cryoglobulinaemia
  • 5C60.1 – Renal tubulo-interstitial disorders in cystinosis
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  • 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

  • GB50 – Acute tubulo-interstitial nephritis
  • GB52 – Acute tubular necrosis
  • GB53 – Acute renal papillary necrosis
  • GB54 – Tubulo-interstitial nephritis, not specified as acute or chronic
  • GB55 – Chronic tubulo-interstitial nephritis
  • GB56 – Obstructive or reflux nephropathy
  • GB57 – Nephrocalcinosis
  • GB58 – Pyonephrosis
  • GB59 – Renal or perinephric abscess
  • GB5Y – Other specified renal tubulo-interstitial diseases
  • GB5Z – Renal tubulo-interstitial diseases, unspecified

Foundation entity

Acute pyelonephritis – http://id.who.int/icd/entity/441183088

Allowed postcoordination axes

Part of: 16: Diseases of the genitourinary system