Nephrotic syndrome w diffuse mesangiocapillary glomrlneph

This code identifies a specific type of nephrotic syndrome characterized by diffuse mesangiocapillary glomerulonephritis (also known as membranoproliferative glomerulonephritis Type I). This condition involves immune complex deposition in the glomeruli, leading to significant proteinuria, hypoalbuminemia, edema, and hyperlipidemia. The diffuse mesangiocapillary pattern refers to the histological appearance of the glomerular injury.

Use this code when documentation explicitly states a diagnosis of nephrotic syndrome and specifies the underlying pathology as diffuse mesangiocapillary glomerulonephritis. This diagnosis is typically confirmed by renal biopsy findings. Supporting documentation should detail the clinical manifestations of nephrotic syndrome alongside the histological report.

• Ensure the pathology report clearly identifies "diffuse mesangiocapillary glomerulonephritis" or "membranoproliferative glomerulonephritis Type I" as the cause of nephrotic syndrome.
• Distinguish this from other forms of membranoproliferative glomerulonephritis (e.g., Type II, dense deposit disease) which have different ICD-10-CM codes.
• Be mindful of the Excludes1 notes; do not code this alongside N04.A if C3 glomerulonephritis or C3 glomerulopathy is documented.