Acute kidney failure with tubular necrosis

This code signifies a sudden and severe decline in kidney function, specifically characterized by damage to the renal tubules. This damage impairs the kidneys' ability to filter waste products and regulate fluid and electrolyte balance, leading to a rapid accumulation of toxins in the body. It represents a critical and often reversible form of acute kidney injury.

Use this code when documentation explicitly states acute kidney failure with evidence of acute tubular necrosis (ATN). This often occurs in the context of ischemic events, nephrotoxic drug exposure, or sepsis. Supporting documentation should include laboratory findings indicative of acute kidney injury (e.g., elevated creatinine, BUN) and clinical evidence or physician's diagnosis of ATN.

• Always confirm the physician's documentation specifies "acute tubular necrosis" to differentiate from other forms of acute kidney injury.
• Do not use this code for chronic kidney disease or acute kidney injury without documented tubular necrosis.
• Sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis when it is a significant co-morbidity.