Wiki HCC query diabetes and its complication

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Please let me know can we code a combination code for diabetes and its complications if linkage is not mentioned in the medical report?

For example, if the patient has diabetes and specific type of glaucoma and we get MEAT for both of them, can we code E11.39 (Type 2 diabetes mellitus with other diabetic ophthalmic complication) and code for glaucoma with diabetes complication dx.

Also, can we assume causal relationship between diabetes and its complication even if the linkage (with or due to) is not mentioned in the medical report by the physician and code a combination dx if we get MEAT for both the diagnoses code?

Thank you in advance.
 
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