Isolated proteinuria w diffuse mesangial prolif glomrlneph

This code signifies a renal disorder characterized by the presence of protein in the urine without other signs of kidney disease, specifically when a kidney biopsy reveals diffuse mesangial proliferative changes. This form of glomerulonephritis involves an increase in mesangial cells and matrix within the glomeruli.

Assign this code when documentation confirms isolated proteinuria and a definitive diagnosis of diffuse mesangial proliferative glomerulonephritis, typically established through renal biopsy. It is appropriate for patients presenting with proteinuria as their primary renal manifestation, and subsequent histological examination identifies this specific glomerular pathology.

• Ensure documentation explicitly states "isolated proteinuria" and "diffuse mesangial proliferative glomerulonephritis" based on biopsy findings.
• Do not use this code if other signs of kidney disease (e.g., hematuria, renal insufficiency) are present, as more specific codes for glomerulonephritis with other manifestations would apply.
• Consider sequencing this code as the primary diagnosis if the isolated proteinuria with this specific glomerulonephritis is the reason for the encounter.