Preventive Care and Screening: Body Mass Index (BMI) Screening and Follow-Up Plan 11.2.000 (healthit.gov)

We're troubleshooting an issue with our EMR vendor and need a clarifying response in order to discover a solution for our current issue. 

We have an example where a patient has a diagnosis on a maintained problem list that falls in the measure set for "Diagnosis": "Underweight". The diagnosis is active and was added in the year 2022. For PY23 - the provider performed an intervention that was in the measure set for "LowInterventionsPerformed.relevantPeriod. 

The point we need clarification on is:

Does the Underweight diagnosis code needs to be added at the same time as the intervention performed or added to a claim during the same PY? Or is existence on the problem list enough to satisfy the measure? 

Our vendor is interpreting the logic below in a way that requires the diagnosis code not only to exist on the problem list on or before the intervention, but to also be added to an encounter diagnosis during the performance year. 

Our providers do not have the same interpretation. 

Please provide guidance if you are able. 

Low BMI Interventions Performed

• ( ["Intervention, Performed": "Follow Up for Below Normal BMI"] LowInterventionsPerformed
  where LowInterventionsPerformed.reason in "Underweight"
  or ( exists ["Diagnosis": "Underweight"] Underweight
  where Underweight.prevalencePeriod starts before or on day of Global."NormalizeInterval" ( LowInterventionsPerformed.relevantDatetime, LowInterventionsPerformed.relevantPeriod )
  and not ( Underweight.prevalencePeriod ends before day of Global."NormalizeInterval" ( LowInterventionsPerformed.relevantDatetime, LowInterventionsPerformed.relevantPeriod ) )
  and Global."NormalizeInterval" ( LowInterventionsPerformed.relevantDatetime, LowInterventionsPerformed.relevantPeriod ) during "Measurement Period"
  )
  )