Other disorders of kidney and ureter (N25-N29)
ICD-10 codes N25 through N29 cover a variety of other kidney and ureter disorders that include problems with the kidney’s tubular function, kidney size and structure abnormalities, ischemic injuries, cyst development, and kidney complications linked to systemic diseases. These codes help detail conditions beyond common kidney diseases and are essential for capturing less typical kidney and ureter disorders.
The N25 codes focus on impaired renal tubular function, including conditions like renal osteodystrophy (N25.0), also known by synonyms such as hyperparathyroidism due to renal insufficiency and chronic kidney disease mineral and bone disorder. They also include nephrogenic diabetes insipidus (N25.1) or vasopressin resistance, where kidneys cannot concentrate urine properly. Codes like N26 and N27 describe abnormalities in kidney size, such as atrophy (N26.1) or small kidney (N27.0-N27.9). The N28 section addresses a range of specified kidney and ureter disorders, including ischemia and infarction of the kidney (N28.0), acquired kidney cysts, and conditions like megaloureter (N28.82) and pyeloureteritis cystica (N28.85). Lastly, N29 covers kidney and ureter diseases arising in systemic conditions like renal disorder due to systemic lupus erythematosus or nephrocalcinosis. These codes assist coders and clinicians in accurately identifying rare or complex renal disorders for proper diagnosis and treatment planning.
Diseases of the genitourinary system (N00–N99)
Other disorders of kidney and ureter (N25-N29)
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
Disorders resulting from impaired renal tubular function (N25)
N26 Unspecified contracted kidney
- N26.1 Atrophy of kidney (terminal)
- N26.2 Page kidney
- N26.9 Renal sclerosis, unspecified
Unspecified contracted kidney (N26)
N27 Small kidney of unknown cause
- N27.0 Small kidney, unilateral
- N27.1 Small kidney, bilateral
- N27.9 Small kidney, unspecified
Small kidney of unknown cause (N27)
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
Other disorders of kidney and ureter, not elsewhere classified (N28)
- N29 Other disorders of kidney and ureter in diseases classified elsewhere
Other disorders of kidney and ureter in diseases classified elsewhere (N29)
Instructional Notations
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
