The ICD-10 code E11 specifically designates Type 2 diabetes mellitus, distinguishing it from other types of diabetes. Type 2 diabetes is characterized by insulin resistance and relative insulin deficiency, unlike Type 1 diabetes (coded as E10), which is an autoimmune condition leading to absolute insulin deficiency. Codes E12 and E13 refer to less common or other specified diabetes types. Accurate coding ensures proper classification for diagnosis, treatment, and epidemiological tracking, making E11 the correct and universally accepted code for Type 2 diabetes mellitus.

Reference: ICD-10 Classification of Diseases, World Health Organization, 2016.