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ICD-10 Code N13.6: Pyonephrosis

N13.6 is a billable ICD-10 diagnosis code used to classify Pyonephrosis in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the genitourinary system (N00-N99).

Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the genitourinary system (N00-N99).

When is it used?

  • May be used when a clinician documents pyonephrosis in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
14Diseases of the genitourinary system (N00-N99)
block
N10-N16Renal tubulo-interstitial diseases
category
N13Obstructive and reflux uropathy
currentN13

Official coding notes

Inclusion terms
  • Conditions in N13.0-N13.5 with infection
  • Obstructive uropathy with infection
Applicable to
  • code (B95-B97), to identify infectious agent.
Use additional code
  • code (B95-B97), to identify infectious agent.

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

UrologistGynecologist

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
N13.6

Common synonyms

Pyonephrosis

Frequently asked questions

Code details

CodeN13.6
SystemICD10
Display namePyonephrosis
ChapterDiseases of the genitourinary system (N00-N99)
BlockRenal tubulo-interstitial diseases

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Abscess(connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)AngulationCalculus, calculi, calculousCalculus, calculi, calculousCalculus, calculi, calculousCalculus, calculi, calculousCalculus, calculi, calculousCalculus, calculi, calculousCalculus, calculi, calculousConstrictionContraction(s), contracture, contractedFasciitis

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.

ICD-10 Code N13.6 for Pyonephrosis | HealthAssure