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E11.321: Type 2 diabetes mellitus with mild nonproliferative diabetic retinopathy with macular edema.

E11.32: Type 2 diabetes mellitus with mild nonproliferative diabetic retinopathy. For example: E11.3: Type 2 diabetes mellitus with ophthalmic complications. The subclassification level then describes the particular manifestation. Subcategory levels first specify the type of complication by system, such as diabetes with kidney complications, ophthalmic complications, neurological complications, and circulatory complications.

Diabetes mellitus (DM) codes in ICD-10-CM are combination codes that include the type of DM, the body system affected, and the complication affecting that body system as part of the code description. In order to understand diabetes coding in ICD-10, it’s worth making a comparison of the structural differences between ICD-9-CM and ICD-10-CM.