Medicine and Ancillary Services Coding
Medicine Section Essentials
The Medicine section covers evaluation and management-adjacent services, immunizations, infusions/injections, psychotherapy, cardiovascular monitoring, and physical medicine. Know the rules for infusion hierarchy (initial vs. subsequent, concurrent vs. sequential) and the difference between push and infusion.
Concepts You Must Know
- Vaccine product vs. administration codes.
- Infusion time documentation and the hierarchy of coding when multiple drugs are given.
- E/M vs. procedure when a service is separately reportable.
- Durable medical equipment and supply coding.
- Telehealth modifiers and originating site rules.
Traps
- Coding an infusion when only a push was documented.
- Missing the initial vs. subsequent distinction when multiple drugs are administered.
- Reporting a vaccine administration code without the product code, or vice versa.
- Assuming all ancillary services are separately payable when bundled.
Rule of Thumb
For infusions: What was the route, what was the time, and was it the first substance or a subsequent one? The hierarchy determines the primary code.
Worked Example
A patient receives two intravenous drugs sequentially. Code the initial infusion service first, then the subsequent service, following the hierarchy and documenting time for each.