The Quality Measure IG is given the acronym QM in the following sentence: 

These include the Quality Measure IG (QM), Data Exchange for Quality Measures (DEQM), the Clinical Practice Guidelines IG (CPG-on-FHIR), and Evidence-based Medicine on FHIR (EBM-on-FHIR).

However, in other places in the IG, QM stands for Quality Measures as in DEQM IG or Quality Measure as in eCQM, Recommendation: place the acronym in front of IG as follows:

Quality Measure (QM) IG