What is the Minimum Data Set?
The Minimum Data Set (MDS) is CMS's standardized resident-assessment instrument for Medicare- and Medicaid-certified nursing facilities. CMS uses assessment-derived data in some nursing-home quality measures, but an MDS record is not a complete clinical history and must be interpreted with its reporting period and measure specification.
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Full name: Minimum Data Set (MDS) 3.0
Short explanation
The Minimum Data Set (MDS) 3.0 is the standardized assessment and data-submission framework used by Medicare- and Medicaid-certified nursing facilities. CMS publishes technical specifications for the assessment and uses assessment-derived information in nursing-home quality-measure reporting. Measure values may also use claims data, eligibility rules, suppression thresholds, and reporting periods. Accordingly, a published MDS-derived measure should be read as a defined CMS indicator, not as a complete account of every resident's care.
Related data: Nursing-home data
How it’s used
- CMS MDS technical information: the specifications describe the assessment and submission framework used by nursing-home and swing-bed providers.
- CMS nursing-home quality measures: public measures can draw on MDS assessments and Medicare claims, subject to CMS's measure definitions and reporting rules.
Frequently asked questions
- Who completes the Minimum Data Set?
- Medicare- and Medicaid-certified nursing facilities complete and submit MDS assessments under CMS requirements for their residents.
- Is MDS data the same as a medical record?
- No. MDS is a standardized assessment and reporting framework. It should not be treated as a complete clinical record for an individual resident.
- How does MDS relate to quality measures?
- CMS uses assessment-derived data in some nursing-home quality measures, alongside measure-specific rules and, for some measures, Medicare claims data.
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