Loading...

    Explore
    • Policy Monitoring
    • Live Policy Feed
    • Billing Codes
    • NPI Medicare & Medicaid
    • Healthcare Providers
    • Health Insurance Payers
    • States
    • Service Lines
    • Taxonomy Codes
    Lookup tools
    • Billing Code Lookup
    • CPT Modifier Lookup
    • Provider Taxonomy Code Lookup
    • Healthcare Provider & Facility Lookup
    • Health Insurance Payer Lookup
    • Payer Contact Directory

    Policy & Benchmark Tools

    • Prior Authorization Lookup
    • Coverage Criteria Lookup
    • Timely Filing Lookup
    • Billing Code Reimbursement Rates
    • Payer Comparison Dashboard
    • Facility Comparison Dashboard
    • All tools

    Company

    • About OpenPayer
    • Data Sources
    • Trek Health
    OpenPayerby Trek Health
    LinkedInYouTube

    © 2026 Trek Health. All rights reserved.

    OpenPayer is built and maintained by Trek Health.

    v1.0.28
    OpenPayerBilling CodesRenal tubulo-interstitial diseasesICD-10-CM n12-tubulo-interstitial-nephritis
    Ask Trek AI about this page

    ICD-10-CM Code For Tubulo-Interstitial Nephritis Not Specified As Acute Or Chronic: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group N12 includes diagnoses of tubulo-interstitial nephritis that are not specified as acute or chronic, covering inflammatory disorders of the renal tubules and interstitium. These ICD-10-CM diagnosis codes are used to document clinical encounters involving renal tubular and interstitial inflammation where acuity is not documented, capturing organ involvement and clinical complexity relevant to renal function. Accurate coding within the ICD-10-CM N12 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

    Customize your policy alerts

    Sign up for ICD-10-CM Code For Tubulo-Interstitial Nephritis Not Specified As Acute Or Chronic: Group Overview policy alerts

    Get alerted when relevant policies change without checking for updates manually.

    Monitor payer policy activity

    Receive email alerts as soon as relevant payer policies are published or updated.

    ICD-10-CM N12: Tubulo-Interstitial Nephritis, Not Specified As Acute Or Chronic Overview

    This group represents diagnoses of tubulo-interstitial nephritis that are not explicitly classified as acute or chronic and involve inflammation of the renal interstitium and tubules. These conditions affect the kidneys and can impact renal function, electrolyte balance, and overall clinical complexity. Accurate coding matters for appropriate clinical documentation and reimbursement because it clarifies disease classification and supports claim processing.

    Table of contents

    Progress1 / 6

    Explore openpayer tools

    • Billing CodesCPT, HCPCS, DRG & more
    • Reimbursement RatesCommercial vs. Medicare rate reports
    • ProvidersHospitals & facilities
    • PayersPlans & market footprint
    • Taxonomy CodesNUCC specialty codes
    • ModifiersCPT modifiers & usage
    • Prior AuthorizationPA policies by payer & drug
    • Timely FilingFiling deadlines by payer
    • Coverage CriteriaMedical necessity by payer
    • Payer ContactsClaims, PA & appeals contacts
    View all tools

    When to Use

    Use a code from this group when the medical record documents tubulo-interstitial nephritis but does not specify whether the condition is acute or chronic. Choose N12 when clinical notes describe renal tubular and interstitial inflammation without temporal descriptors or when documentation is insufficient to assign acute or chronic codes.

    ICD-10-CM Codes

    1 rows

    ICD-10-CM CodeDescription
    N12Tubulo-interstitial nephritis, not specified as acute or chronic

    DRG Codes

    4 rows

    DRG CodeDescription
    689Kidney and Urinary Tract Infections with MCC
    690Kidney and Urinary Tract Infections without MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems

    Typical Clinical Scenarios

    • An adult patient presents to the emergency department with several days of flank pain, fever, and dysuria after a recent urinary tract infection; labs show elevated serum creatinine and urinalysis with white blood cell casts but no clear chronic changes on imaging. The acute inflammatory picture localized to the renal interstitium without documentation of chronicity leads to assignment of a tubulo-interstitial nephritis, not specified as acute or chronic diagnosis. Typical codes: N12.
    • An older patient seen in outpatient nephrology for new-onset reduced kidney function discovered on routine labs, with bland urinalysis except for mild proteinuria and no prior history indicating chronic interstitial disease; renal ultrasound is unremarkable and the clinician documents interstitial nephritis without specifying acute versus chronic. Because the record indicates tubulo-interstitial involvement but does not classify it as acute or chronic, a non-specified tubulo-interstitial nephritis code is used. Typical codes: N12.
    • A hospitalized patient with multisystem illness on multiple medications develops worsening renal function and eosinophiluria; the team documents interstitial nephritis as the cause of acute kidney injury but the chart does not explicitly state acuity versus chronicity in the diagnostic entry. In the presence of interstitial tubular involvement recorded without explicit acute or chronic designation, the non-specified tubulo-interstitial nephritis code is assigned as the appropriate diagnosis. Typical codes: N12.

    Related Codes

    N10-ACUTE-PYELONEPHRITIS

    ICD-10-CM Code For Acute Pyelonephritis: Group Overview

    N11-CHRONIC-TUBULO-INTERSTITIAL-NEPHRITIS

    ICD-10-CM Code For Chronic Tubulo-Interstitial Nephritis: Group Overview

    N13-OBSTRUCTIVE-AND-REFLUX-UROPATHY

    ICD-10-CM Code For Obstructive And Reflux Uropathy: Group Overview

    N14-DRUG-AND-HEAVY-METAL-INDUCED-TUBULO-INTERSTITIAL-CONDITIONS

    ICD-10-CM Code For Drug- And Heavy-Metal-Induced Tubulo-Interstitial And Tubular Conditions: Group Overview

    N15-OTHER-RENAL-TUBULO-INTERSTITIAL-DISEASES

    ICD-10-CM Code For Other Renal Tubulo Interstitial Diseases: Group Overview

    N16-RENAL-TUBULO-INTERSTITIAL-DISORDERS

    ICD-10-CM Code For Renal Tubulo-Interstitial Disorders In Diseases Classified Elsewhere: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
    Published by

    Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

    Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.