Question #1, Chapter 4.1 in the 2015 CMS QRDA IG provides the following guidance: "A QRDA-I document should be submitted for each patient who meets the Initial Patient Population criteria of an eCQM. The QRDA-I base standard allows either one or multiple measures to be reported in a QRDA-I document. For group practice reporting, CMS requires only one QRDA-I report to be submitted per patient aggregated for the group's Tax Identification Number (TIN) for a reporting period. For individual provider reporting, there should be one QRDA-I report per patient for the eligible professional's unique National Provider Identification (NPI) and Tax Identification Number (TIN) combination. For Hospital Quality Reporting, there should be one QRDA-I report per patient for the facility CMS Certification Number (CCN). " Question 2: There is no specific guidance indicating extra data will make the document to be rejected. In general, patient data contained in a QRDA-I document are data required to support measures calculation, and they must conform to the CMS QRDA IG. Question 3: For the 2015 reporting year, please refer to the 2015 CMS QRDA IG and the 2015 CMS QRDA IG Addendum for details. In addition to schema validation, schematron validation (including CMS specific constraints), validations could include things such as where @sdtc:valueSet binding occurs, the code has to be a valid code drawn from that eCQM value set per VSAC.