In the case of a leg amputation due to gangrene from diabetic peripheral circulatory disorder, what ICD-10-CM code applies?

The appropriate ICD-10-CM code for a leg amputation due to gangrene from diabetic peripheral circulatory disorder is E11.52. This code specifically identifies type 2 diabetes mellitus with diabetic peripheral angiopathy, which is commonly a complication in patients with diabetes that can lead to conditions necessitating amputation.

When selecting this code, it's important to note that it captures both the underlying condition (type 2 diabetes) and the complication (peripheral angiopathy), which is a critical aspect for accurate documentation and medical billing purposes. The inclusion of the term "gangrene" in the description of the case indicates a severe progression of the condition—it highlights the presence of tissue necrosis, which is a direct result of impaired blood flow associated with vascular complications of diabetes.

The other codes available pertain to different manifestations of diabetic complications or do not specify the presence of peripheral angiopathy, which is crucial in this situation. Thus, E11.52 is the most precise choice, aligning with the clinical details given in the scenario.