Nephritis and nephropathy, not specified as acute or chronic, with lesion of renal medullary necrosis

This code signifies kidney inflammation or disease that is not specified as acute or chronic, specifically characterized by the presence of renal medullary necrosis. This condition involves the death of tissue in the inner part of the kidney, often leading to impaired kidney function.

Use this code when documentation indicates nephritis or nephropathy with confirmed renal medullary necrosis, but the provider has not specified the acuity (acute or chronic) of the underlying kidney disease. This is typically supported by pathology reports, imaging studies, or clinical notes detailing the specific lesion.

• Ensure the documentation explicitly states "renal medullary necrosis" and that the acuity of the nephritis/nephropathy is not specified.
• Avoid using this code if the nephritis or nephropathy is clearly documented as acute (e.g., 580.x) or chronic (e.g., 585.x).
• Always look for an underlying cause of the renal medullary necrosis, as this may require additional coding.