N11

ICD-10Non-billable category

Chronic tubulo-interstitial nephritis

Official ICD-10-CM descriptor (FY2026)

Chronic tubulo-interstitial nephritis

N11 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.

Includes

chronic infectious interstitial nephritis
chronic pyelitis
chronic pyelonephritis

Use additional code

Report an additional code to identify the associated condition.

code (B95-B97), to identify infectious agent.

More specific codes under N11

Where this code sits

Chapter: 14. Diseases of the genitourinary system (N00-N99)
Block: Renal tubulo-interstitial diseases (N10-N16)

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.