No, unless otherwise stated in the specifications, quality measures do not have thresholds that must be met.
With that said, CMS 68 is similar to KM-15 (core): Maintaining an up-to-date list of medications for more than 80% of patients. Both sets of data require the same action of updating the medication list. However, they differ in that CMS 68 is for patients age 18+ and must be captured at every visit, whereas KM-15 is for all patients at any given time. It is unlikely that there would be a large variance between CMS 68 and KM-15. NCQA requests a note be added in QPASS if CMS 68 differs greatly from KM-15's 80% requirement. This is to provide context to the Review Oversight Committee to better understand your practice and environment.
If your practice is in Annual Reporting, practices attest that they are in compliance with all core criteria and could provide evidence that they are meeting the more than 80% requirement of KM-15.
PCMH 2017