Toxic nephropathy, not elsewhere classified

This code signifies kidney damage or dysfunction directly caused by exposure to toxic substances, excluding those with specific ICD-10-CM codes. It reflects a non-inflammatory renal injury resulting from exogenous or endogenous toxins.

Apply this code when documentation clearly states toxic nephropathy due to a substance not otherwise classified, such as certain heavy metals, industrial chemicals, or unclassified medications. Ensure the medical record explicitly links the renal impairment to a toxic exposure.

• Do not use this code if a more specific code exists for the toxic agent (e.g., drug-induced tubulo-interstitial nephritis).
• Always code the underlying toxic agent (e.g., T-code for poisoning or adverse effect) as a secondary diagnosis, if known and documented.
• Ensure documentation specifies "toxic" nephropathy to differentiate from other forms of acute or chronic kidney disease.