Type 1 diabetes mellitus with diabetic nephropathy

This code signifies a diagnosis of Type 1 diabetes mellitus complicated by diabetic nephropathy, a kidney disease resulting from long-standing diabetes. It indicates that the patient's kidneys are affected by the diabetic process, typically manifesting as proteinuria or decreased renal function.

Use this code when documentation clearly states Type 1 diabetes and explicitly mentions diabetic nephropathy or diabetic kidney disease. Supporting documentation often includes laboratory findings such as elevated albumin-to-creatinine ratio, decreased GFR, or a renal biopsy confirming diabetic changes.

• Always ensure the documentation specifies "Type 1" diabetes; do not use for Type 2.
• Code also any associated chronic kidney disease (CKD) stage, if documented, as a secondary diagnosis.
• Confirm that the nephropathy is explicitly linked to the diabetes; other causes of kidney disease should be coded separately.