Do I need to use value sets to calculate these institutional rebalancing and utilization measures? If so, where can I find the value sets?

Yes. Value sets are the complete set of procedure and codes used to identify a service or condition included in a measure. All three of the rebalancing measures—LTSS Admission to an Institution from the Community, LTSS Minimizing Institutional Length of Stay, and LTSS Successful Transition after Long-Term Institutional Stay—use the "Institutional Facility"value set (XLSX, 2.88 MB). See Table 2 in the "LTSS Value Sets to Codes" tab. Table 1 in the "LTSS Measures to Value Sets" tab shows each value set needed for each measure.