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BETA v.3.0

2025 CPT code 46020

Placement of a seton.

Refer to CPT guidelines for specific instructions on coding surgical procedures on the anus.

Modifiers may be applicable. Modifier 22 (Increased Procedural Services) may be used if the procedure was significantly more complex than usual.Modifier 50 (Bilateral Procedure) is applicable if the procedure was performed on both sides.

Medical necessity for placement of a seton is established by the presence of a symptomatic anal fistula requiring management to prevent complications such as abscess formation or persistent drainage.

The physician places the seton to treat an anal fistula. This helps prevent abscess formation and promotes healing.

In simple words: Placement of a drain in an anal fistula to help it heal.

Placement of a seton for the management of an anal fistula. This involves inserting a thread or drain into the fistula tract to facilitate drainage and healing.

Example 1: A patient presents with a persistent anal fistula.After examination, the physician decides to place a seton to manage the fistula and allow it to drain and heal., A patient with Crohn's disease develops a complex anal fistula. A seton is placed to manage the drainage and prevent further complications., Following an anal abscess drainage, a seton is placed to prevent recurrence and facilitate complete healing of the fistula tract.

Documentation should include the diagnosis of anal fistula, the type of seton used, the location of placement, and any associated procedures performed.

** There are two types of setons: loose and cutting. The choice of seton depends on the specific clinical situation.

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