E10.21
BillableType 1 diabetes mellitus with diabetic nephropathy
HCC Category Mapping
What This Code Means
Type 1 diabetes with kidney damage characterized by protein loss in urine, indicating early to moderate kidney disease from diabetes.
Coding Tips
- •Verify documentation specifies diabetic nephropathy rather than other kidney conditions
- •This code indicates kidney involvement but may need additional codes if chronic kidney disease stage is documented
Clinical Significance
Type 1 diabetes mellitus with diabetic nephropathy represents early to moderate kidney damage from Type 1 diabetes, characterized by persistent albuminuria that progresses through stages from microalbuminuria to overt proteinuria. Diabetic nephropathy is the leading cause of end-stage renal disease in the United States. In Type 1 diabetes, nephropathy typically develops 10-15 years after diagnosis and is a strong predictor of cardiovascular mortality, making early detection through annual screening and aggressive management with ACE inhibitors or ARBs critical.
Documentation Requirements
- ✓The provider must document diabetic nephropathy with supporting evidence such as urine albumin-to-creatinine ratio, 24-hour urine protein, or documented microalbuminuria.
- ✓The diagnosis must be linked to Type 1 diabetes.
- ✓If chronic kidney disease staging is also present, E10.22 may be more appropriate.
- ✓Current medications including nephroprotective agents should be documented.