Access

This mandatory standard provides 

Core 25 – Access to and Monitoring of Services
The organization:
(a) Establishes standards to assure that consumers or clients have access to services: and (Primary)
(b) Defines and monitors its performance with respect to the access standards. (Primary)
Note what URAC says in the first bullet of the Interpretive Information (at least in some versions):  "Core 25 does not refer only to network adequacy. It refers to any services that the organization provides." 

So, if you are applying for Health Plan or Health Network accreditation, be sure you submit some sort of access documentation in addition to the network adequacy you'll be submitting under the applicable Network Management standards.  Telephone statistics are a good "go-to" for nearly all URAC applicants under this standard.   URAC explains: "Many programs use telephone statistics to measure access to program services.  After establishing acceptable standards, measurements are periodically taken to ensure consumer and client access to services. Access standards related to telephone services should include standards regarding returning or responding to after hours calls and/or voice messages."