What identification must be provided by the prescriber for a narcotic prescription?

The requirement for a prescriber to provide their license number on a narcotic prescription is crucial for ensuring the legitimacy of the prescription and maintaining proper control over controlled substances. This license number serves as a unique identifier that allows pharmacists and regulatory bodies to verify the prescriber's credentials and their authority to prescribe narcotics.

In the context of narcotics, where strict regulations are in place to prevent misuse and ensure patient safety, having a valid prescriber’s license number helps to confirm that the individual is indeed authorized to issue prescriptions for these medications. This is an essential aspect of the legal framework surrounding the prescribing of controlled substances, as it helps mitigate the risks of prescription fraud and abuse.

The other options, while potentially useful in specific contexts, do not serve this primary function. A driver's license might establish an identity, but it does not verify the authority to prescribe medication. A business license is unrelated to the individual prescriber's qualifications, and an insurance number typically pertains to financial matters, not the practice of prescribing medication. Therefore, the prescriber’s license number is the critical identifier needed to validate narcotic prescriptions.