Isolated proteinuria with C3 glomerulonephritis

This code represents a kidney disorder characterized by the presence of protein in the urine (proteinuria) without other significant signs of kidney disease, specifically in the context of C3 glomerulonephritis. C3 glomerulonephritis is a rare autoimmune kidney disease where the complement system protein C3 is deposited in the glomeruli, leading to inflammation and damage.

Use this code when documentation specifies isolated proteinuria and a confirmed diagnosis of C3 glomerulonephritis. This typically applies to patients presenting with proteinuria as the primary or sole manifestation of their C3 glomerulonephritis. Supporting documentation would include renal biopsy results confirming C3 glomerulonephritis and laboratory findings indicating proteinuria.

• Ensure the documentation explicitly states "isolated proteinuria" in conjunction with "C3 glomerulonephritis."
• Do not code this alongside N06.6 (Isolated proteinuria with dense deposit disease) as per the Excludes1 note.
• Confirm that other causes of proteinuria, such as diabetes or hypertension, are not the primary etiology, or are coded separately if present.