Depends on details
A dvt's treatment depends on where it is located.
If it involves only the calf veins and not the proximal deep veins (like the popliteal vein), then it may be treated with short term anticoagulation. If it involves the deep veins, six months of anticoagulation is standard. Of course, "appropriate" treatment must be individualized to each patient based on their medical risk factors. Details matter!