Under federal and Ohio law, which of the following prescriptions requires a diagnosis code by the prescriber?

The correct answer identifies that specific prescriptions necessitate a diagnosis code from the prescriber, particularly for those related to Medicare Part B and all controlled substance prescriptions. Under federal regulations and specific state laws, Medicare Part B generally covers services and products that are medically necessary. Consequently, these prescriptions require a diagnosis code to validate the medical necessity for coverage and to help prevent fraud and abuse in the usage of prescribed medications.

Furthermore, controlled substances, which include drugs that have a high potential for misuse, also require a diagnosis code. This requirement is in place to ensure that these medications are prescribed only when deemed medically appropriate, contributing to responsible prescribing practices and better patient outcomes.

In contrast, not all prescriptions require a diagnosis code, as many non-controlled medications can be dispensed without this additional information. Consequently, stating that all prescriptions or only certain categories (such as only those under Medicare Part A) require such a code would be incorrect. Hence, the focus on Medicare Part B and all controlled substance prescriptions is key to understanding these regulations.