ICD-10-CM · Chapter 14 · N00-N99
N11 Chronic tubulo-interstitial nephritis
Includes
- chronic infectious interstitial nephritis
- chronic pyelitis
- chronic pyelonephritis
Use Additional Code
- code (B95-B97), to identify infectious agent.
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| N11..0 | Nonobstructive reflux-associated chronic pyelonephritis | Yes |
| N11..1 | Chronic obstructive pyelonephritis | Yes |
| N11..8 | Other chronic tubulo-interstitial nephritis | Yes |
| N11..9 | Chronic tubulo-interstitial nephritis, unspecified | Yes |
Last reviewed: September 2026