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<title>Logical Observation Identifier Names and Codes (LOINC) | The Measures Management System</title>
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<span><strong>Measure Testing</strong></span>
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<span>Measure Testing Process</span>
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<span>Overview</span>
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<span>Develop The Testing Work Plan</span>
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<span>Implement, Analyze, Refine &amp; Retest</span>
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<span>Measure Testing Summary</span>
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<span>Testing Respecified Measures</span>
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<span>Importance</span>
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<span>Usability &amp; Use</span>
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<span>Measure Selection</span>
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<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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<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>Continuing Evaluation</span>
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<span>Measure Maintenance Reviews</span>
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<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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<span>Overview</span>
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<span>Interested Party Engagement in the Measure Lifecycle</span>
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<a href="/measure-lifecycle/stakeholder-engagement/roles">
<span>Roles in Engagement</span>
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<a href="/measure-lifecycle/stakeholder-engagement/types">
<span>Types of Interested Party Engagement</span>
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<span>Supplemental Materials</span>
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<span>MMS Tools</span>
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<span>CMS Tools</span>
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<span>External Resources</span>
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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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<span>Pre-Rulemaking Resources</span>
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<span><strong>Get Involved</strong></span>
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<span>Technical Expert Panels</span>
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<a href="/get-involved/technical-expert-panel/overview">
<span>Overview</span>
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<a href="/get-involved/technical-expert-panel/current">
<span>Current TEP Opportunities</span>
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<a href="/get-involved/technical-expert-panel/updates">
<span>Updates to Established TEPs</span>
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<span>Public Comments</span>
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<span>Overview</span>
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<a href="/get-involved/public-comments/current">
<span>Current Public Comment Opportunities</span>
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<a href="/get-involved/public-comments/summaries">
<span>Summaries of Past Public Comments</span>
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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>News By Month</span>
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<a href="/news-events/event-calendar">
<span>Event Calendar</span>
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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/specify-code/overview" class="usa-breadcrumb__link"><span>Specify The Code</span></a>
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<span>Logical Observation Identifier Names and Codes (LOINC)</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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<h1 class="margin-0">
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<div property="schema:text" class="field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>LOINC is a <abbr tabindex="0" title="&lt;p&gt;A code system is a managed collection of concepts with each concept represented by at least one internally unique code and a human-readable description (e.g., SNOMED CT).&lt;/p&gt; " class="glossify-tooltip-tip" lang="en">code system</abbr> (i.e., set of identifiers, names, and codes) for clinical and laboratory observations, health care screening/survey instruments, and document type identifiers. Each LOINC record corresponds to a single observation of almost any type (i.e., observables) and is best known for concepts that represent laboratory tests. LOINC also includes representation of document types and thus, frequently represents a document section in consolidated clinical document architecture (C-CDA) and other templated exchange standards. There is no intent for LOINC codes to transmit all possible information about a test or observation; the intent is only to identify the observations. The LOINC code for a name is unique and permanent. Systems should always transmit LOINC codes with a hyphen before the check digit (e.g., 10154-3) and transmit the numeric code as a variable length number, without leading zeros. LOINC codes are available for commercial use without charge, subject to the terms of a license that assures the integrity and ownership of the codes.</p>
<dl class="ckeditor-accordion">
<dt>Special Situations with LOINC Survey/Evaluation Tools</dt>
<dd>
<p>Measure developers can use LOINC to represent survey instrument questions (observations). In survey instruments, there is tight <span class="glossify-exclude">alignment</span> between the question and the acceptable set of answers. Because of this, LOINC often also includes specific answer sets for the survey questions, called LOINC Answers (LA codes). When defining the set of answers specifically within the survey, the LA set is normative, which means only the specified LA codes are acceptable responses (values) for that LOINC observable. Defined normative LA sets can occur anywhere in LOINC, and because they are a requirement when defined, users of LOINC must look for and respect these restrictions.</p>
<p>Assignment of a LOINC code to most LOINC survey/evaluation tools for the overall tool is a type of LOINC Panel because that is the LOINC construct that collects other LOINC codes used together. In addition, LOINC curators assign a different LOINC code for each evaluation question/observation included in the survey or evaluation tool. In some cases, the LOINC survey will reuse observations defined in a different (usually related) survey. In many cases, the LOINC survey will include information on the ownership of the survey and indicate whether the individual observations are copyright protected and whether survey users can use the independent observations outside of&nbsp;the complete survey instrument as a complete questionnaire.</p>
<p>Many survey instruments include summary final <span class="glossify-exclude">scores</span> (i.e., a LOINC observation) based on a sum of the values associated with the specified LA codes allowed for all the component questions. The measure developer should consider all elements of a LOINC tool before use and take care when using LOINC observables with specified answer codes to determine whether there is a requirement for use of the LA codes of that set.</p>
</dd>
</dl>
<p>A measure developer may need to request new LOINC concepts and can find instructions and tools to request LOINC concepts on the <a href="http://loinc.org/"><em>LOINC</em></a> website. Measure developers should account for contractual timelines when considering applying for new concepts.</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="2023-10-25T10:20:51-04:00">Oct 2023</time>
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