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ICD-10 Code N12: Tubulo-interstitial nephritis, not specified as acute or chronic

N12 is a billable ICD-10 diagnosis code used to classify Tubulo-interstitial nephritis, not specified as acute or chronic 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 tubulo-interstitial nephritis, not specified as acute or chronic 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
currentN10-N16

Official coding notes

Inclusion terms
  • Interstitial nephritis NOS
  • Pyelitis NOS
  • Pyelonephritis NOS
Excludes1 (do not code together)
  • calculous pyelonephritis (N20.9)

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

Coverage-related procedures and services

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
N12

Common synonyms

Tubulo-interstitial nephritis, not specified as acute or chronic

Frequently asked questions

Code details

CodeN12
SystemICD10
Display nameTubulo-interstitial nephritis, not specified as acute or chronic
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
Disease, diseasedDisease, diseasedNephritis, nephritic(albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)Nephritis, nephritic(albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)PyelonephritisPyonephritis

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 N12 for Tubulo-interstitial nephritis, not specified as acute or chronic | HealthAssure