I don't think you will find such a document as the provider is NOT required to attach dx codes, other than perhaps office policy. The provider needs to indicate the diagnosis, but not the codes. Many EHR systems will attach codes when the physician selects a written diagnosis, but a coder (or anyone depending on employer policy) may correct the code.
Real life example: provider documents a diagnosis of high risk HPV from cervical PAP. However, when provider types "HPV" in EHR, B97.7 comes up, which is "Papillomavirus as the cause of diseases classified elsewhere." Without query to provider, we may correct B97.7 to R87.810. We are correcting the code, but not changing the diagnosis.
Some employers may require their physicians to assign codes, but I am certainly not a fan of such a policy.