Acute kidney failure, unspecified

This code represents a sudden and severe decline in kidney function where the underlying cause is not specified. It indicates an abrupt inability of the kidneys to adequately filter waste products from the blood, leading to an accumulation of toxins and electrolyte imbalances.

This code is appropriate when documentation clearly states "acute kidney failure" without further specification of the cause or type (e.g., acute tubular necrosis, prerenal, postrenal). It should be used when the provider has not identified or documented the specific etiology of the acute renal impairment.

• Avoid using this code if a more specific type of acute kidney failure is documented (e.g., N17.0 for acute kidney failure with tubular necrosis).
• Always review the entire medical record for any clues regarding the underlying cause, as a more specific code will improve data accuracy and reimbursement.
• Do not confuse with chronic kidney disease (CKD) codes (N18.-); this code signifies an acute, often reversible, condition.