| N10 | Acute tubulo-interstitial nephritis |
| N11 | Chronic tubulo-interstitial nephritis |
| N11.0 | Nonobstructive reflux-associated chronic pyelonephritis |
| N11.1 | Chronic obstructive pyelonephritis |
| N11.8 | Other chronic tubulo-interstitial nephritis |
| N11.9 | Chronic tubulo-interstitial nephritis, unspecified |
| N12 | Tubulo-interstitial nephritis, not specified as acute or chronic |
| N13 | Obstructive and reflux uropathy |
| N13.1 | Hydronephrosis with ureteral stricture, not elsewhere classified |
| N13.2 | Hydronephrosis with renal and ureteral calculous obstruction |
| N13.3 | Other and unspecified hydronephrosis |
| N13.30 | Unspecified hydronephrosis |
| N13.39 | Other hydronephrosis |
| N13.4 | Hydroureter |
| N13.5 | Crossing vessel and stricture of ureter without hydronephrosis |
| N13.6 | Pyonephrosis |
| N13.7 | Vesicoureteral-reflux |
| N13.70 | Vesicoureteral-reflux, unspecified |
| N13.71 | Vesicoureteral-reflux without reflux nephropathy |
| N13.72 | Vesicoureteral-reflux with reflux nephropathy without hydroureter |
| N13.721 | Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral |
| N13.722 | Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral |
| N13.729 | Vesicoureteral-reflux with reflux nephropathy without hydroureter, unspecified |
| N13.73 | Vesicoureteral-reflux with reflux nephropathy with hydroureter |
| N13.731 | Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral |
| N13.732 | Vesicoureteral-reflux with reflux nephropathy with hydroureter, bilateral |
| N13.739 | Vesicoureteral-reflux with reflux nephropathy with hydroureter, unspecified |
| N13.8 | Other obstructive and reflux uropathy |
| N13.9 | Obstructive and reflux uropathy, unspecified |
| N14 | Drug- and heavy-metal-induced tubulo-interstitial and tubular conditions |
| N14.0 | Analgesic nephropathy |
| N14.1 | Nephropathy induced by other drugs, medicaments and biological substances |
| N14.2 | Nephropathy induced by unspecified drug, medicament or biological substance |
| N14.3 | Nephropathy induced by heavy metals |
| N14.4 | Toxic nephropathy, not elsewhere classified |
| N15 | Other renal tubulo-interstitial diseases |
| N15.0 | Balkan nephropathy |
| N15.1 | Renal and perinephric abscess |
| N15.8 | Other specified renal tubulo-interstitial diseases |
| N15.9 | Renal tubulo-interstitial disease, unspecified |
| N16 | Renal tubulo-interstitial disorders in diseases classified elsewhere |