| N25 | Disorders resulting from impaired renal tubular function |
| N25.0 | Renal osteodystrophy |
| N25.1 | Nephrogenic diabetes insipidus |
| N25.8 | Other disorders resulting from impaired renal tubular function |
| N25.81 | Secondary hyperparathyroidism of renal origin |
| N25.89 | Other disorders resulting from impaired renal tubular function |
| N25.9 | Disorder resulting from impaired renal tubular function, unspecified |
| N26 | Unspecified contracted kidney |
| N26.1 | Atrophy of kidney (terminal) |
| N26.2 | Page kidney |
| N26.9 | Renal sclerosis, unspecified |
| N27 | Small kidney of unknown cause |
| N27.0 | Small kidney, unilateral |
| N27.1 | Small kidney, bilateral |
| N27.9 | Small kidney, unspecified |
| N28 | Other disorders of kidney and ureter, not elsewhere classified |
| N28.0 | Ischemia and infarction of kidney |
| N28.1 | Cyst of kidney, acquired |
| N28.8 | Other specified disorders of kidney and ureter |
| N28.81 | Hypertrophy of kidney |
| N28.82 | Megaloureter |
| N28.83 | Nephroptosis |
| N28.84 | Pyelitis cystica |
| N28.85 | Pyeloureteritis cystica |
| N28.86 | Ureteritis cystica |
| N28.89 | Other specified disorders of kidney and ureter |
| N28.9 | Disorder of kidney and ureter, unspecified |
| N29 | Other disorders of kidney and ureter in diseases classified elsewhere |