When a patient is seen for preventive care and receives an immunization, which code is coded as the first-listed service?

• A. Immunization code
• B. Preventive care code
• C. Wellness code
• D. Office visit code

Answer: (B)

When a patient comes in for preventive care and also receives an immunization, the main reason for the encounter is the preventive care visit. Coding guidelines designate the preventive care code as the first-listed (primary) service because it represents the primary purpose of the visit. The immunization is a separate procedure that is billed in addition to the preventive code, not as the main service. So, the first-listed code should reflect the preventive care evaluation/serve (the preventive medicine code), with the immunization coded separately on the claim.

If you considered the other options: billing an immunization code first would imply the primary purpose of the visit was the vaccine, which isn’t accurate here. A wellness code essentially conveys the same preventive concept, but the standard practice is to use the preventive care code as the first-listed. An office visit or general E/M code would suggest the encounter was for a problem-focused visit, which isn’t the case when the visit is for preventive care with an immunization.