Wiki Guidelines concering payable diagnosis and provider choices

[DK47]

Is there a citation that states that an electronic health record cannot limit choices for ICD-10 diagnosing? Is it ethical to only give providers access to diagnosis codes that you know are "payable"? I am really looking for rules, guidelines or statutes that support diagnosis the problem regardless of the payment.

I know back in the day (a long time ago) providers would carry around a list of "most frequently" used diagnosis ICD-9 codes.

Thank you!