N11

Non-billable

Chronic tubulo-interstitial nephritis

N11 is the ICD-10-CM code for Chronic tubulo-interstitial nephritis. It is a non-billable category code — use a more specific child code such as N11.0 for billing.

Status
Header (non-billable)
Chapter
N00-N99
Subcodes
4
Edition
FY2026

N00-N99 Diseases of the genitourinary system

Includes

  • chronic infectious interstitial nephritis
  • chronic pyelitis
  • chronic pyelonephritis

Use additional code

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

Frequently asked questions

What is ICD-10 code N11?
N11 is the ICD-10-CM code for "Chronic tubulo-interstitial nephritis". It falls under N00-N99 Diseases of the genitourinary system.
Is N11 a billable code?
No — N11 is a non-billable header code. Use a more specific child code (such as N11.0) for billing.
What are the subcodes of N11?
N11 has 4 more specific child codes, including N11.0, N11.1, N11.8.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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