It is unclear if the CMS EHR Certification ID section is required to be included in the QRDA3 for 2019 PI's.
 
According to the 2019_CMS_QRDA_III_Eligible_Clinicians_and_EP_IG_Addendum, in the general description for CMS EHR Certification ID it states 
 
    "As part of their submission, participants shall include a CMS EHR Certification ID that represents the CEHRT used by the individual or group during the performance period."
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But later on in the Table of Template Changes:
    "MAY contain zero or one [0..1] participant (CONF:CMS_77) such that it"

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  The description uses Shall, which should mean required, but the template table lists it as MAY, which should mean optional. Which is it?