Acute kidney failure with lesion of tubular necrosis

This code signifies a sudden and severe decline in kidney function, specifically caused by damage to the renal tubules, leading to their death (necrosis). This acute injury impairs the kidneys' ability to filter waste products from the blood, resulting in a rapid buildup of toxins.

Apply this code when documentation clearly indicates acute renal failure alongside a diagnosis of acute tubular necrosis (ATN). This is often seen in cases of severe ischemia, nephrotoxic drug exposure, or sepsis leading to kidney injury. Supporting documentation should include laboratory findings consistent with acute kidney injury (e.g., elevated creatinine, BUN) and a physician's explicit diagnosis of ATN.

• Ensure the documentation specifies "acute" kidney failure and "tubular necrosis" to differentiate from other forms of renal failure.
• Do not use this code for chronic kidney disease or unspecified acute kidney injury without evidence of tubular necrosis.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any underlying causes or associated conditions.