Final answer:
The correct root operation for the procedure described as "freeing of vagus nerve root from surrounding scar tissue via open approach" in ICD-10-PCS is 'release'.
Step-by-step explanation:
In ICD-10-PCS (International Classification of Diseases, Tenth Revision, Procedure Coding System), the correct root operation for "freeing of vagus nerve root from surrounding scar tissue via open approach" is C) release. The operation described is the surgical freeing of the vagus nerve root, which has been constricted by scar tissue. The root operation release is used in ICD-10-PCS to describe procedures where a body part is freed from an abnormal physical constraint by cutting or by the use of force.
This procedure does not involve cutting the body part itself, but rather the scar tissue constraining the nerve. It neither removes nor destroys the constraining tissue, which excludes the root operations division, extirpation, and detachment. The open approach simply refers to the method of reaching the affected area and does not affect the choice of root operation.