Polyneuropathy is not linked to hyperlipidemia in the ICD-10 index, so I would not presume that to be the etiology. I would query the provider for the disease that is associated with the polyneuropathy, or if that is not possible, I would code it as G62.9 - polyneuropathy, unspecified - since your documentation does not support report that this is a component of another disease process.
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Thank u so much