Can you list 12 diagnosis and only 1 CPT

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I am wondering if you can put 12 diagnoses in line 21 when you are only using one CPT code pointing to four of these diagnoses. If a patient sees the provider and has acute and chronic diagnoses that need reporting, for risk adjustment purposes, but only one CPT is required for the visit, is this acceptable? Many providers feel you can only put a diagnosis in line 21 if they have enough CPT codes to cover them, Example: if the provider codes 8 diagnosis they feel they must have 2 CPT codes. Does this make sense?
You can list up to 12 Dx. Codes . However you may link only those that supply medical necessity for a particular CPT/HCPCs code. So it is totally allowable to have codes on a claim that are not linked.