I would not use 250.70 and 429.9 since 250.70 states "DM w Peripheral circulatory disorders", (e.g., gangrene, PVI, etc) I would you 250.80, "DM w/ other manifestations". It can be use for "Not elsewhere Classified (previous) Conditions". Code 429.9, it is a NOS (Heart Disease, Not specified), on the other hand 425.8 "Cardiomyopathy in other diseases classified elsewhere" is more specific and gives you the chance to use it with other diseases codes. See notes underneath of code saying "as:".
So, I would code 250.80, 425.8 unless there is another official guideline. Remember, coding is a literally translation from what is documented to codes.
I hope this helps you out.