Saturday, November 7, 2026

ICD-10-CM code N01.5 represents rapidly progressive nephritic syndrome with diffuse mesangiocapillary glomerulonephritis, a severe renal condition characterized by a swift decline in kidney function. This code encompasses both membranoproliferative glomerulonephritis types 1 and 3, as well as unspecified cases presenting with a rapidly progressive clinical course. Coders must pay close attention to clinical documentation to confirm the rapidly progressive nature and specific histological subtype before assigning this code. Distinguishing between acute, rapidly progressive, and chronic forms of nephritic syndrome is critical for accurate clinical representation and proper reimbursement. Proper sequencing relies on whether the glomerular disease is primary or secondary to an underlying systemic condition.