ICD10BillableValid for clinical use
ICD-10 Code N11.9: Chronic tubulo-interstitial nephritis, unspecified
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 chronic tubulo-interstitial nephritis, unspecified 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
N11Chronic tubulo-interstitial nephritis
currentN11
Official coding notes
Inclusion terms
- Chronic interstitial nephritis NOS
- Chronic pyelitis NOS
- Chronic pyelonephritis NOS
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
Related codes
Sibling codes
Coverage-related procedures and services
CPT 74177high
COMPUTED TOMOGRAPHY, ABDOMEN AND PELVIS; WITH CONTRAST MATERIAL(S)
Source: CMS coverage guidance
CPT 74176high
COMPUTED TOMOGRAPHY, ABDOMEN AND PELVIS; WITHOUT CONTRAST MATERIAL
Source: CMS coverage guidance
CPT 74178high
COMPUTED TOMOGRAPHY, ABDOMEN AND PELVIS; WITHOUT CONTRAST MATERIAL IN ONE OR BOTH BODY REGIONS, FOLLOWED BY CONTRAST MATERIAL(S) AND FURTHER SECTIONS IN ONE OR BOTH BODY REGIONS
Source: CMS coverage guidance
CPT 74160high
COMPUTED TOMOGRAPHY, ABDOMEN; WITH CONTRAST MATERIAL(S)
Source: CMS coverage guidance
CPT 74150high
COMPUTED TOMOGRAPHY, ABDOMEN; WITHOUT CONTRAST MATERIAL
Source: CMS coverage guidance
CPT 74170high
COMPUTED TOMOGRAPHY, ABDOMEN; WITHOUT CONTRAST MATERIAL, FOLLOWED BY CONTRAST MATERIAL(S) AND FURTHER SECTIONS
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 236374007high
Chronic infective interstitial nephritis
Source: SNOMED International ICD-10 map
SNOMED_CT 197762003high
Chronic pyelitis
Source: SNOMED International ICD-10 map
SNOMED_CT 63302006high
Chronic pyelonephritis
Source: SNOMED International ICD-10 map
SNOMED_CT 1144909003high
Chronic tubulo-interstitial nephritis due to connective tissue disorder
Source: SNOMED International ICD-10 map
SNOMED_CT 60926001high
Chronic tubulointerstitial nephritis
Source: SNOMED International ICD-10 map
SNOMED_CT 1144903002high
Chronic tubulointerstitial nephritis due to ischaemia
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
N11.9
Common synonyms
Chronic tubulo-interstitial nephritis, unspecifiedChronic tubulo-interstitial nephritis
Frequently asked questions
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.