Final answer:
A letter to an insurance company should typically be signed by the office manager or the lead physician, as they are usually the authorized individuals to handle such matters within a medical office. The option (E) is correct.
Step-by-step explanation:
A letter to the insurance company should be signed by the individual who has the authority and knowledge about the insurance claim or policy. In general, this could be the office manager or the lead physician, as they have the administrative oversight and responsibility for the operations of the medical office, including handling insurance matters.
Letters of a medical nature might require the signature of someone with the proper credentials, such as the lead physician, to lend the necessary authority and authenticity. It's important to adhere to the specific guidelines or regulations provided by the insurance company or the medical office policy when determining who should sign off on such communications. Therefore, option (E) is correct.