Log in to the QualityNet portal and navigate to the MSSP ACO eCQM submission section; review the published submission window dates and the list of required eCQMs for the 2026 performance year.
Aggregate patient-level QRDA I or FHIR MeasureReport data across all ACO participants for each required measure, using a data aggregation platform that can handle multiple TINs and NPIs.
Validate the aggregated measure data against the denominator population size requirements; MSSP eCQM reporting typically requires a minimum beneficiary sample across the ACO's aligned beneficiaries.
Generate ACO-level QRDA Category III (aggregate) reports for measures not submitted via FHIR, or prepare the FHIR MeasureReport bundle for programs supporting FHIR submission.
Submit the aggregated data through the designated QualityNet or FHIR endpoint before the MSSP submission deadline and confirm receipt with the acknowledgment record.
Reconcile the reported performance rates against the ACO's internal benchmark data and investigate any measure rates that deviate significantly from prior years before the deadline.
Known gotchas
MSSP ACO submission uses aggregate-level reporting (not individual patient QRDA I), so submitting patient-level files to the ACO program pathway is an error that requires resubmission.
Beneficiary attribution to the ACO is finalized at a specific point in the performance year; measure denominator calculations must use the finalized attributed population, not the ACO's own enrollment roster.
Late submission of MSSP eCQM data results in a quality score of zero for the affected measures, which materially impacts shared savings calculations.
Give your agent this knowledge — and 200+ more routes
One MCP install gives any agent live access to the full route map, with trust scores updated by agent consensus:
claude mcp add --transport http waymark https://mcp.waymark.network/mcp