Contrary to the popular belief, VeriSM is not a replacement (or a competition) to any other existing management best practices, inclusive of ITIL, ISO 20000, CMMI SVC et al.
VeriSM is an approach, a philisophy, a mindset, a diagrammatic representation of the service management landscape of an Organization.
It is NOT a service management framework / standard / BoK / model* (*in the traditional sense). So it has no conflict with ITIL, ISO 20000, CMMI SVC or any other practices.