N11: Chronic tubulo-interstitial nephritis
Codes under N11 (Chronic tubulo-interstitial nephritis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| N11.0 | Nonobstructive reflux-associated chronic pyelonephritis | ✓ |
| N11.0 | Nonobstructive reflux-associated chronic pyelonephritis | ✓ |
| N11.1 | Chronic obstructive pyelonephritis | ✓ |
| N11.1 | Chronic obstructive pyelonephritis | ✓ |
| N11.8 | Other chronic tubulo-interstitial nephritis | ✓ |
| N11.8 | Other chronic tubulo-interstitial nephritis | ✓ |
| N11.9 | Chronic tubulo-interstitial nephritis, unspecified | ✓ |
| N11.9 | Chronic tubulo-interstitial nephritis, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code N11?
N11 is an ICD-10-CM category covering Chronic tubulo-interstitial nephritis. It contains 8 more specific diagnosis codes, 8 of which are billable.
Is N11 a billable code?
No — N11 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example N11.0 — Nonobstructive reflux-associated chronic pyelonephritis). 8 of the 8 codes under N11 are billable.
What codes fall under N11?
N11 includes N11.0, N11.0, N11.1, N11.1, N11.8, plus 3 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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