An integrated module for extracorporeal blood treatment has a flat-shaped support element which exhibits on an internal face thereof a complex of fluid distribution lines and on an external face thereof a high-flow dialyzer. The support element has a base body which exhibits fixture seatings, each of which houses an axially extended tract of a fluid distribution line. The tract of the fluid distribution line, with respect to adjacent tracts, has an increased diameter due to the presence of a junction collar made of a rigid material. Each fixture seating exhibits two axial locators for positioning the axially extended tract of a fluid distribution line in a fixed position. The locators interact with the junction collar, and the distribution lines can be fixed to the base body by a resilient fixture of the junction collars in the seatings without gluing. The module is configured to be mounted on an apparatus for intensive treatment of renal insufficiency.