Final answer:
The biller should post the denial and adjust the patient's balance, as the follow-up visit falls under the procedure's 90-day global period and is not separately billable.
Step-by-step explanation:
The next step for the biller after a claim denial for an E/M code submitted for a follow-up visit within the global period of a procedure would be option 3: Post the denial and adjust the patient's balance because the follow-up visit is included in the global period of the procedure. Procedures with a global period typically include all related post-operative care within a specified time frame after the procedure.
In this case, with a 90-day global period, the follow-up visit falls into this timeframe and is not typically separately billable. Therefore, the follow-up visit should generally not be billed to the patient or their insurance separately, and the denied claim does not become the patient's responsibility.