AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2026 Issue 3; Ask the Editor
Double Diabetes Mellitus
A patient was documented to have both type 1 and type 2 diabetes mellitus with significant insulin resistance. There is an Excludes1 note at both categories E10, Type 1 diabetes mellitus, and E11, Type 2 diabetes mellitus, that does not allow codes from these categories to be assigned together. What is the appropriate code assignment when documentation reflects both type 1 and type 2 diabetes mellitus?
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