Modifier AI is used to identify the principal physician of record. It is an informational modifier.
To identify admitting or attending physician who oversees the patient’s care during a hospital admission;
Admitting physician appends to the initial inpatient hospital care evaluation and management service (99221-99223);
Admitting physician appends to the initial nursing facility evaluation and management service (99304-99306); and
Append after payment modifiers
Reported by any physician other than attending or admitting physician who oversees the patient’s care during the hospital, or nursing home admission; and
Reported on procedures codes other than 99221-99223 and 99304-99306