Secondary hyperoxaluria, unspecified

This code signifies an elevated level of oxalate in the urine or plasma that is not due to a primary genetic defect in oxalate metabolism. It indicates that the hyperoxaluria is a consequence of another underlying condition, such as intestinal malabsorption, dietary factors, or certain medications. This can lead to the formation of calcium oxalate kidney stones and nephrocalcinosis.

Use this code when documentation confirms secondary hyperoxaluria without specifying the underlying cause. This is appropriate when the physician has identified elevated oxalate levels and ruled out primary hyperoxaluria, but further investigation into the specific secondary etiology is pending or not yet determined. Supporting documentation would include laboratory results showing elevated oxalate and physician notes indicating secondary hyperoxaluria.

• Only use this code when the specific secondary cause of hyperoxaluria is unknown or unspecified in the medical record.
• If the underlying cause of secondary hyperoxaluria is identified (e.g., Crohn's disease, short bowel syndrome), code the specific underlying condition first, followed by the appropriate code for secondary hyperoxaluria if available and specified.
• Distinguish carefully from primary hyperoxaluria (E72.53), which is a genetic disorder.