I'm not sure if you're asking about DSL or FiOS service.
DSL service requires a DSL modem, not a DOCSIS modem.
FiOS does not use modems, just routers. FiOS routers do have a MoCA (coax) port to talk to the ONT and set-top-boxes. You can use non-Verizon routers with FiOS, but it requires an Ethernet connection from the ONT instead of MoCA. If FiOS TV is used, a Verizon router must be in the mix.
So, the short answer is there is no Verizon service that uses DOCSIS. Cable-modems are not used with Verizon services.