Thank you for your inquiry regarding CMS2v13 Preventive Care and Screening: Screening for Depression and Follow-Up Plan. You are correct, the denominator for this measure is described as “All patients aged 12 years and older at the beginning of the measurement period with at least one qualifying encounter during the measurement period”. These qualifying encounters, or “visits” are defined in the measure using this statement: Qualifying Encounter During Measurement Period ( ["Encounter, Performed": "Encounter to Screen for Depression"]   union ["Encounter, Performed": "Physical Therapy Evaluation"]   union ["Encounter, Performed": "Telephone Visits"] ) QualifyingEncounter   where QualifyingEncounter.relevantPeriod during "Measurement Period" The qualifying encounter (i.e., visit) must be documented using a code included in "Encounter to Screen for Depression” (2.16.840.1.113883.3.600.1916), "Physical Therapy Evaluation" (2.16.840.1.113883.3.526.3.1022), or "Telephone Visits" (2.16.840.1.113883.3.464.1003.101.12.1080) value set. These encounter codes are not tied to a facility type (e.g., ambulatory, outpatient, inpatient hospital), so if one of the codes in the value set is documented, that meets the definition of a qualifying (eligible) encounter. These value sets are located on The National Library of Medicine's Value Set Authority Center (VSAC), https://vsac.nlm.nih.gov/ . The VSAC provides downloadable access to all official versions of value set content contained in the eCQM specifications. The value sets are lists of unique coded identifiers with names (called descriptors) for groupings of clinical and administrative concepts selected from standard vocabularies. Note that eligible encounters or “visits” may be defined differently in other MIPS quality measures. For example, other measures may not include Telephone Visits as an eligible encounter. Therefore the logic and value sets for each measure must be examined to determine how it defines an eligible encounter.