IDSS Redesign

For HEDIS 2021, HEDIS measure data will be collected in the new format through the updated IDSS system. With this new format, the data elements under the measures will be more relational, modular, reusable and meaningfully named and structured. Measures with different stratifications will have data points gathered in groups such as age, gender and socio-economic status.

IDSS V2 Information

Below are the Final My2020 files. These files include all updates from MY2020 HEDIS Volume 2 specification. These files should also be used during January testing.

Supporting Documents

Submission Files

Schema Files

Data Dictionary


Results Files

Mapping Files (only available for MY2020)

Test Files

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