Final answer:
The correct coding for a 55-year-old woman with type 2 diabetes scheduled for amputation of gangrenous toes is E11.52 for the diabetes with peripheral angiopathy and L97.529 for the non-pressure ulcer of the foot.
Step-by-step explanation:
The correct coding and sequencing for a patient who is a 55-year-old woman with type 2 diabetes, admitted for gangrenous toes with necrotic muscle on the left foot due to non-healing ulcers, and scheduled for amputation of the toes is E11.52, L97.529. The primary diagnosis code is for diabetes with peripheral angiopathy and no mention of gangrene (E11.52), while the additional code L97.529 is for the non-pressure ulcer of the other part of the foot with unspecified severity, which captures the issue of the necrotic ulcers. It is important to list diabetes as the primary condition because the conditions of the foot are complications of the underlying diabetes.