Type 1 diabetes mellitus, presymptomatic, Stage 2

This code identifies individuals with Type 1 diabetes mellitus who are in a presymptomatic, Stage 2 phase. This stage is characterized by the presence of multiple diabetes-related autoantibodies and dysglycemia, but without overt clinical symptoms of diabetes. It signifies a high risk for progression to symptomatic Type 1 diabetes.

Use this code for patients who have tested positive for two or more islet autoantibodies (e.g., GAD65, ICA512, insulin autoantibodies) and exhibit abnormal glucose tolerance, such as impaired fasting glucose or impaired glucose tolerance, but have not yet developed classic symptoms of hyperglycemia. Documentation must clearly indicate the presence of multiple autoantibodies and evidence of dysglycemia without symptomatic diabetes.

• Ensure documentation specifies "presymptomatic" and "Stage 2" to differentiate from other stages of Type 1 diabetes.
• Do not use this code if the patient has already developed clinical symptoms of diabetes; instead, use codes for symptomatic Type 1 diabetes.
• This code is typically used in conjunction with codes for the specific autoantibodies identified, if available and clinically relevant.