IDSS

Each HEDIS season, a compilation of IDSS file updates are posted for Health plans submitting HEDIS data to NCQA. These files are referenced by health plans and HEDIS certified vendors and auditors to utilize during the IDSS process.

Below are the Final HEDIS MY 2025 IDSS files. Changes to the files compared to the previous year can be found in the crosswalk section. More information on measure specific changes can be found in the HEDIS Volume 2 Technical specification. The IDSS system will be available in March 2026.

NOTE: EXCHANGE WILL BE FINALIZED IN MID OCTOBER

Login to IDSS here.

Submission Files

• Final Commercial MY2025
• Final LTSS MY2025
• Final Medicaid MY2025
• Final Medicare MY2025
• Final Exchange MY2025

Schemas

• Final Commercial 2025
• Final LTSS MY2025
• Final Medicaid MY2025
• Final Medicare MY2025
• Final Exchange MY2025

Data Dictionary

• Final Commercial MY2025
• Final LTSS MY2025
• Final Medicaid MY2025
• Final Medicare MY2025
• Final HEDIS Indicator MY2025
• Final HEDIS Measure MY2025
• Final HEDIS Supporting Document MY2025
• Final Exchange MY2025

Crosswalks

• Final Commercial Crosswalk MY2025
• Final Medicaid Crosswalk MY2025
• Final Medicare Crosswalk MY2025
• Final Validation Crosswalk MY2025
• Final Indicator Crosswalk MY2025
• Final Measure Crosswalk MY2025
• Final Calculation Specifications Crosswalk MY2025
• Final Exchange Crosswalk MY2025

Validations

• Final HEDIS Validation Dictionary MY2025
• Final HEDIS Validation Supporting Document MY2025

Calculations

• Final HEDIS Calculation Dictionary MY2025
• Final HEDIS Calculation Supporting Document MY2025

Results Files

• Final Commercial Results XML MY2025
• Final LTSS Results XML MY2025
• Final Medicaid Results XML MY2025
• Final Medicare Results XML MY2025
• Final Exchange Results XML MY2025