99391 Established patient preventive visit, under 1 yearCPT · BillingBrief summaryA periodic comprehensive preventive medicine visit (well-baby checkup) for an established patient under 1 year old.Copy codeWhat to knowPreventive codes are chosen by patient age.Related codes99381 New patient preventive visit, under 1 year CPT99392 Established patient preventive visit, ages 1 to 4 CPT