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  2. ICD-10-CM Codes List
  3. N00–N99
  4. N25-N29
  5. Other disorders of kidney and ureter, not elsewhere classified (N28)

Other disorders of kidney and ureter, not elsewhere classified (N28)

The ICD-10 code section N28 covers various other disorders of the kidney and ureter not classified elsewhere. It includes specific conditions like ischemia or infarction of the kidney, acquired kidney cysts, hypertrophy, and several less common kidney and ureter disorders. These codes help accurately identify and document kidney and ureter problems that do not fit into more common categories.

The category includes N28.0 for conditions such as renal artery occlusion, ischemic nephropathy, and acute tubular necrosis, which are often referred to by synonyms like renal infarction or acute renal failure due to ischemia. Code N28.1 is used for acquired kidney cysts, sometimes called acquired renal cystic disease or hydatid cyst of the kidney. Other codes cover conditions like hypertrophy of the kidney (N28.81), also known as compensatory hypertrophy, and megaloureter (N28.82), which refers to ureter dilation. The section also includes codes for various cystic and inflammatory disorders, such as pyelitis cystica and ureteritis cystica. Lastly, the N28.9 code allows for documentation of unspecified disorders of the kidney and ureter, useful when the precise diagnosis is not clearly defined but kidney or ureter disorder symptoms are present. This set of codes supports precise coding in less common or complex renal and ureteral diseases important for patient management and insurance billing.

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Acute Kidney Injury

Abrupt reduction in kidney function. Acute kidney injury encompasses the entire spectrum of the syndrome including acute kidney failure; ACUTE KIDNEY TUBULAR NECROSIS; and other less severe conditions.

Azotemia

A biochemical abnormality referring to an elevation of BLOOD UREA NITROGEN and CREATININE. Azotemia can be produced by KIDNEY DISEASES or other extrarenal disorders. When azotemia becomes associated with a constellation of clinical signs, it is termed UREMIA.

Frasier Syndrome

A syndrome characterized by CHRONIC KIDNEY FAILURE and GONADAL DYSGENESIS in phenotypic females with karyotype of 46,XY or female individual with a normal 46,XX karyotype. It is caused by donor splice-site mutations of Wilms tumor suppressor gene (GENES, WILMS TUMOR) on chromosome 11.

Pyelitis

Inflammation of the KIDNEY PELVIS and KIDNEY CALICES where urine is collected before discharge, but does not involve the renal parenchyma (the NEPHRONS) where urine is processed.

Renal Insufficiency

Conditions in which the KIDNEYS perform below the normal level in the ability to remove wastes, concentrate URINE, and maintain ELECTROLYTE BALANCE; BLOOD PRESSURE; and CALCIUM metabolism. Renal insufficiency can be classified by the degree of kidney damage (as measured by the level of PROTEINURIA) and reduction in GLOMERULAR FILTRATION RATE.

Renal Insufficiency, Chronic

Conditions in which the KIDNEYS perform below the normal level for more than three months. Chronic kidney insufficiency is classified by five stages according to the decline in GLOMERULAR FILTRATION RATE and the degree of kidney damage (as measured by the level of PROTEINURIA). The most severe form is the end-stage renal disease (CHRONIC KIDNEY FAILURE). (Kidney Foundation: Kidney Disease Outcome Quality Initiative, 2002)

Ureterocele

A cystic dilatation of the end of a URETER as it enters into the URINARY BLADDER. It is characterized by the ballooning of the ureteral orifice into the lumen of the bladder and may obstruct urine flow.