What information might be needed when querying a patient index to determine whether or not a patient has been seen at the practice in the past?

When querying a patient index to determine if a patient has been seen at a practice, essential information includes the patient's full name, date of birth, and possibly additional identifiers such as a social security number or insurance details. The query may also require the practice's specific patient ID or account number, if applicable. Having accurate and complete information helps ensure a successful match in the patient index.