The doctor (physician) invoice can be used by any licensed physician to bill a patient for services completed based on their medical practice. The invoice should be very detailed in regard to the descriptions of procedures, examinations, tests, reviews, and other tasks performed by the physician. Depending on the medical practice, a patient may be charged other fees related to administration or scheduling. Some patients may be covered by an insurance plan, so receiving a comprehensive invoice is essential. Regardless of whether or not the services are covered by insurance, the patient is required to make the necessary payments within the appropriate time frame (as written on the invoice).