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<span>Encoding Clinical Information</span>
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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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<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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<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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<span>MUC Lists and Recommendation Reports</span>
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<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>
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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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<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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<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" >
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<a href="/get-involved/public-comments/overview">
<span>Overview</span>
</a>
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<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 Target/Initial Population</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 Target/Initial Population</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;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> refers to the cohort from which to select 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>&nbsp;<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>. Some measures (e.g.,&nbsp;<abbr tabindex="0" title="&lt;p&gt;A &lt;span class=&quot;glossify-exclude&quot;&gt;ratio&lt;/span&gt; is a score derived by dividing a count of one type of data by a count of another type of data (e.g., number of patients with central lines who develop infection divided by the number of central line days). The key to the definition of a &lt;span class=&quot;glossify-exclude&quot;&gt;ratio&lt;/span&gt; is that the numerator is not in the denominator.&lt;/p&gt; " class="glossify-tooltip-tip" lang="en">ratio</abbr>&nbsp;measures) require multiple target/initial populations, one for the <abbr tabindex="0" title="&lt;p&gt;The &lt;span class=&quot;glossify-exclude&quot;&gt;numerator&lt;/span&gt; is the upper portion of a fraction used to calculate a rate, proportion, or ratio. Also called the measure focus, it is the target process, condition, event, or outcome. &lt;span class=&quot;glossify-exclude&quot;&gt;Numerator&lt;/span&gt; criteria are the processes or outcomes expected for each patient, procedure, or other unit of measurement defined in the denominator. A &lt;span class=&quot;glossify-exclude&quot;&gt;numerator&lt;/span&gt; statement describes the action satisfying the conditions of the performance measure.&lt;/p&gt; " class="glossify-tooltip-tip" lang="en">numerator</abbr> and one for the denominator.</p>
<p>Details often include information based on specific age groups, diagnoses, diagnostic and procedure codes, and enrollment periods.</p>
<p>If the measure is part of a&nbsp;<abbr tabindex="0" title="&lt;p&gt;A measure set is a group of measures related in some way such as measures addressing a specific condition, procedure, or specialty.&lt;/p&gt; " class="glossify-tooltip-tip" lang="en">measure set</abbr>, the broadest group of population for inclusion in the set of measures is the target/initial population. The measure developer must specify codes or other data necessary to identify this cohort, as well as any sequencing of steps needed to identify cases for inclusion.</p>
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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="2022-12-28T10:21:13-05:00">Dec 2022</time>
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