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<span>Overview</span>
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<span>Measure Testing Process</span>
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<a href="/measure-lifecycle/measure-testing/process/overview">
<span>Overview</span>
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<a href="/measure-lifecycle/measure-testing/process/develop-workplan">
<span>Develop The Testing Work Plan</span>
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<a href="/measure-lifecycle/measure-testing/process/perform-sampl">
<span>Perform Sampling</span>
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<a href="/measure-lifecycle/measure-testing/process/implement-and-analyze">
<span>Implement, Analyze, Refine &amp; Retest</span>
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<a href="/measure-lifecycle/measure-testing/process/summary">
<span>Measure Testing Summary</span>
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<a href="/measure-lifecycle/measure-testing/process/testing-respecified-measures">
<span>Testing Respecified Measures</span>
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<span>Overview</span>
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<span>Importance</span>
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<span>Scientific Acceptability</span>
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<span>Feasibility</span>
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<a href="/measure-lifecycle/measure-testing/evaluation-criteria/usability">
<span>Usability &amp; Use</span>
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<span><strong>Measure Implementation</strong></span>
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<span>Overview</span>
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<span>Measure Selection</span>
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<span>Pre-Rulemaking</span>
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<span>Overview</span>
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<a href="/measure-lifecycle/measure-implementation/pre-rulemaking/guidance-measure-submitters">
<span>Guidance for Measure Submitters</span>
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<span>Measure Priorities</span>
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<a href="/measure-lifecycle/measure-implementation/pre-rulemaking/lists-and-reports">
<span>MUC Lists and Recommendation Reports</span>
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<a href="/measure-lifecycle/measure-implementation/rollout">
<span>Measure Rollout</span>
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<span>CMS Consensus-Based Entity (CBE) Endorsement and Maintenance</span>
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<a href="/measure-lifecycle/measure-implementation/CMS-CBE-EM/overview">
<span>Overview</span>
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<a href="/measure-lifecycle/measure-implementation/CMS-CBE-EM/Measure-Submission-to-the-CMS-CBE">
<span>Measure Submission to the CMS CBE</span>
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<a href="/measure-lifecycle/measure-implementation/CMS-CBE-EM/Endorsement-Process">
<span>The CMS CBE Endorsement Process</span>
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<span><strong>Measure Use, Continuing Evaluation &amp; Maintenance</strong></span>
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<span>Measure Production &amp; Monitoring</span>
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<a href="/measure-lifecycle/measure-use/evaluation">
<span>Continuing Evaluation</span>
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<span>Measure Maintenance Reviews</span>
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<span>Overview</span>
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<a href="/measure-lifecycle/measure-use/maintenance/annual-update">
<span>Annual Update</span>
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<a href="/measure-lifecycle/measure-use/maintenance/comprehensive-reevaluation">
<span>Comprehensive Reevaluation</span>
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<a href="/measure-lifecycle/measure-use/maintenance/early-maintenance-review">
<span>Early Maintenance Review</span>
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<a href="/measure-lifecycle/measure-use/maintenance/harmonization-during-maintenance">
<span>Harmonization during Measure Maintenance</span>
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<span><strong>Interested Party Engagement</strong></span>
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<a href="/measure-lifecycle/stakeholder-engagement/overview">
<span>Overview</span>
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<a href="/measure-lifecycle/stakeholder-engagement/lifecycle">
<span>Interested Party Engagement in the Measure Lifecycle</span>
</a>
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<a href="/measure-lifecycle/stakeholder-engagement/roles">
<span>Roles in Engagement</span>
</a>
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<a href="/measure-lifecycle/stakeholder-engagement/types">
<span>Types of Interested Party Engagement</span>
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<span>Tools &amp; Resources</span>
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<span><strong>MMS Tools &amp; Resources</strong></span>
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<a href="/tools-and-resources/mms-supplemental-materials">
<span>Supplemental Materials</span>
</a>
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<a href="/tools-and-resources/mms-templates">
<span>Templates for Measure Development</span>
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<a href="/educational-resources">
<span>Educational Resources</span>
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<a href="/mms-tools">
<span>MMS Tools</span>
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<span><strong>Additional Tools &amp; Resources</strong></span>
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<a href="/cms-tools">
<span>CMS Tools</span>
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<a href="/external-resources">
<span>External Resources</span>
</a>
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<a href="https://mmshub.cms.gov/glossary">
<span>Glossary</span>
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<span><strong>Pre-Rulemaking Resources</strong></span>
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<a href="/Pre-Rulemaking-Resources">
<span>Pre-Rulemaking Resources</span>
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<span>Get Involved</span>
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<span><strong>Get Involved</strong></span>
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<li class="usa-nav__submenu-item menu_level_2 is_collapsed ">
<a href="/get-involved/how-to">
<span>How to Get Involved</span>
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<span>Technical Expert Panels</span>
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<li class="usa-nav__submenu-item menu_level_2 is_collapsed ">
<a href="/get-involved/technical-expert-panel/overview">
<span>Overview</span>
</a>
</li>
<li class="usa-nav__submenu-item menu_level_2 is_collapsed ">
<a href="/get-involved/technical-expert-panel/current">
<span>Current TEP Opportunities</span>
</a>
</li>
<li class="usa-nav__submenu-item menu_level_2 is_collapsed ">
<a href="/get-involved/technical-expert-panel/updates">
<span>Updates to Established TEPs</span>
</a>
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<li class="usa-nav__submenu-item menu_level_2 is_expanded">
<button id="usa-accordion__button_second-1 usa-nav__submenu-list-2" class="usa-accordion__button_second usa-nav__link is_expanded closed" aria-expanded="false" aria-controls="basic-nav-section-Get-Involved">
<span>Public Comments</span>
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<ul id="basic-nav-section-Public-Comments" class="usa-nav__submenu-list-2 is_collapsed " aria-controls="extended-mmega-nav-section-Public-Comments" >
<li class="usa-nav__submenu-item menu_level_2 is_collapsed ">
<a href="/get-involved/public-comments/overview">
<span>Overview</span>
</a>
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<li class="usa-nav__submenu-item menu_level_2 is_collapsed ">
<a href="/get-involved/public-comments/current">
<span>Current Public Comment Opportunities</span>
</a>
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<li class="usa-nav__submenu-item menu_level_2 is_collapsed ">
<a href="/get-involved/public-comments/summaries">
<span>Summaries of Past Public Comments</span>
</a>
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</ul>
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<a href="/get-involved/call-for-measures">
<span>Call for Measures</span>
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<a href="/get-involved/other-involvement">
<span>Other Types of Involvement</span>
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<span>News &amp; Events</span>
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<span><strong>News &amp; Events</strong></span>
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<span>News &amp; Events</span>
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<a href="/news-events/news-by-month">
<span>News By Month</span>
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<a href="/news-events/event-calendar">
<span>Event Calendar</span>
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<a href="/" class="usa-breadcrumb__link"><span>Home</span></a>
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<a href="/measure-lifecycle/measure-specification/overview" class="usa-breadcrumb__link"><span>Measure Specification</span></a>
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<a href="/measure-lifecycle/measure-specification/develop-specification/overview" class="usa-breadcrumb__link"><span>Develop Specifications</span></a>
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<span>Define The Denominator</span>
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<div class="views-row"><div class="views-field views-field-field-parent-title"><h1 class="field-content"><span class="glossify-exclude">Measure <abbr tabindex="0" title="&lt;p&gt;&lt;span class=&quot;glossify-exclude&quot;&gt;Specifications&lt;/span&gt; are measure instructions addressing data elements, data sources, point of data collection, timing and frequency of data collection and reporting, specific instruments used (if appropriate), and implementation strategies.&lt;/p&gt; " class="glossify-tooltip-tip" lang="en">Specification</abbr></span></h1></div></div>
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<a href="/measure-lifecycle/measure-specification/specify-code">Specify the Code</a>
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<h1 class="margin-0">
<span property="schema:name">Define the Denominator</span>
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<div property="schema:text" class="field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>The <abbr tabindex="0" title="&lt;p&gt;The &lt;span class=&quot;glossify-exclude&quot;&gt;denominator&lt;/span&gt; is a statement describing the population evaluated by the performance measure and is the lower part of a fraction used to calculate a rate, proportion, or ratio. It can be the same as the target/initial population or a subset of the target/initial population to further constrain the population for the purpose of the measure. CV measures may refer to this as measure population.&lt;/p&gt; " class="glossify-tooltip-tip" lang="en">denominator</abbr> statement describes the <abbr tabindex="0" title="&lt;p&gt;The &lt;span class=&quot;glossify-exclude&quot;&gt;population&lt;/span&gt; is the total group of people of interest for a quality measure, sometimes called the target/initial &lt;span class=&quot;glossify-exclude&quot;&gt;population&lt;/span&gt;. The measure &lt;span class=&quot;glossify-exclude&quot;&gt;population&lt;/span&gt; is a defined subset appropriate to the measure set not excluded from the individual measure.&lt;/p&gt; " class="glossify-tooltip-tip" lang="en">population</abbr>&nbsp;evaluated by the individual measure. The population defined by the denominator can be the same as the <abbr tabindex="0" title="&lt;p&gt;The &lt;span class=&quot;glossify-exclude&quot;&gt;target/initial population&lt;/span&gt; refers to all events for evaluation by a specific performance measure involving patients who share a common set of specified characteristics within a specific measurement set to which a given measure belongs. Measured entities should draw all patients/episodes (e.g., as numerator, as denominator) from the &lt;span class=&quot;glossify-exclude&quot;&gt;target/initial population&lt;/span&gt;.&lt;/p&gt; " class="glossify-tooltip-tip" lang="en">target/initial population</abbr>, or it can be a subset of the target/initial population to further constrain the population for the measure. The measure developer must describe the denominator statement sufficiently so the reader understands the eligible population or composition of the denominator, and should not use codes in lieu of words to express concepts in written descriptions. The measure developer should define the denominator precisely and include parameters such as</p><ul><li>Age ranges</li><li>Setting</li><li>Diagnosis</li><li>Procedures</li><li><abbr tabindex="0" title="&lt;p&gt;The &lt;span class=&quot;glossify-exclude&quot;&gt;time interval&lt;/span&gt; is the time frame used to determine cases for inclusion in the denominator, numerator, or exclusion. The &lt;span class=&quot;glossify-exclude&quot;&gt;time interval&lt;/span&gt; includes an index event and period of time.&lt;/p&gt; " class="glossify-tooltip-tip" lang="en">Time interval</abbr></li><li>Other qualifying events, e.g., look-back period</li></ul><p><strong>Format: </strong>Patients, age [age or age range], with [condition] in [setting] during [time frame]</p><dl class="ckeditor-accordion"><dt><strong>Examples</strong></dt><dd><ul><li>All patients aged 18 and older with a diagnosis of major depressive disorder (MDD)&nbsp;(<a href="https://cmit.cms.gov/cmit/#/FamilyView?familyId=30">CMIT Member ID 30</a>)&nbsp;(<abbr tabindex="0" title="&lt;p&gt;The Medicare Improvements for Patients and Providers Act of 2008 requires the U.S. Department of Health and Human Services to contract with a consensus-based entity (CBE) regarding performance measurement. The CMS CBE endorses quality measures through a transparent, consensus-based process incorporating feedback from diverse groups of interested parties to foster health care quality improvement.&lt;/p&gt; " class="glossify-tooltip-tip" lang="en">CMS CBE</abbr> #0104e)</li><li>All patients at least 18 years old as of the first day of the reporting month who are determined to be maintenance hemodialysis (HD) patients (in-center and home HD) for the complete reporting month at the same facility (<a href="https://cmit.cms.gov/cmit/#/FamilyView/?familyId=313">CMIT Member ID 313</a>)&nbsp;(CMS CBE #2978)</li></ul></dd></dl></div>
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<div class="views-row"><span class="views-field views-field-changed"><strong class="views-label views-label-changed">Last Updated: </strong><span class="field-content"><time datetime="2024-03-12T14:05:22-04:00">Mar 2024</time>
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