When a patient is registered in Thrive and upon inquiry they respond that they have not received any immunizations since their last visit, should I document that no vaccine was administered in the immunizations menu?

No. If the patient has not had any vaccines administered since their last visit, no new entry should be added to the immunization entry menu. Each entry made in this menu creates a record that is subsequently sent to your immunization registry via the public health interface. Each record should contain the vaccine that was received by the patient, or an explanation as to why the patient did not receive a vaccination. For example, CVX code 998 is utilized in the CPSI software to document that no vaccine was administered due to evidence of immunity. Evidence of immunity indicates that a person has plausible evidence that they have already developed immunity to a particular disease and further immunization against the disease is not likely to provide benefit. When a user selects "No vaccine administered" (CVX 998) in immunization entry, the Evidence of Immunity field should be addressed to attach an applicable SNOMED code and description to indicate that a patient is immune to a specific disease.

In summary, if the patient has not received any vaccines at any other facility since their last visit at your facility, no entry should be made in the immunization entry menu.