CPT codes (99381-99397 and 99401-99429) used when billing for medical services provided to prevent the occurrence of illness or injury.

Health care to keep an individual healthy or to prevent illness (e.g., Papanicolaou tests, pelvic examinations, influenza shots, screening mammograms).

In the medical field, this relates to a patient who has had prior hospitalization, medical services, or surgery. This information is in a system that is used to check claims before approval is given to the provider of the service.