Modifier 79- Unrelated Procedure or Service by the Same Physician During the Postoperative Period

Modifier 79 is used when a provider performs an unrelated procedure during the postoperative period of another surgery.

What is Modifier 79?

Modifier 79 tells insurance payers that a procedure performed during a postoperative period is unrelated to the original surgery.

When to Use Modifier 79

• A new unrelated procedure is performed
• The patient develops a separate condition
• The procedure is outside routine postoperative care
• A second surgery is medically necessary

Billing Example

A patient recovering from hand surgery later requires an unrelated skin lesion removal during the global period. Modifier 79 may be appended to the procedure code.

Documentation Tips

• Clearly document the unrelated condition
• Separate the new procedure from postoperative care
• Include medical necessity details
• Avoid overlap with routine follow-up services

Common Denial Reasons

• Documentation does not support unrelated procedure
• Procedure considered postoperative care
• Insufficient provider notes
• Incorrect modifier usage