Which root operation involves cutting into a body part but not removing it?

The root operation that involves cutting into a body part without removing it is "Restriction." This operation is defined in ICD-10-PCS as an operation where a body part is partially constricted or narrowed, such as in certain surgical procedures that aim to reduce the size of a lumen or a cavity without excising or completely removing it.

Restriction is typically associated with procedures done on structures like blood vessels or the gastrointestinal tract, where the intent is to limit the flow or the volume without taking out any tissue. This distinguishes it from other operations like excision or resection, which involve the removal of body parts.

In contrast, incision refers to making a cut into a body part but does not imply either removal or maintenance of structure, while excision specifically denotes cutting out or cutting away a portion of a body part. Resection entails removing an entire body part or a substantial portion of it. These definitions clarify how restriction uniquely focuses on the act of cutting into a body part for reasons that may not involve its removal.