SNOMED CT Identifier Check

The form below performs the SCTID Check-Digit computation and checking. It also identifies the namespace element of an identifier. Below the form is an expandable box including the JavaScript code used to perform these computations.
Partial Identifier (without check-digit)
SNOMED CT Identifier
Result of check
Component type
Namespace
This Verhoeff checking part of this code was based on a webpage at:
http://www.augustana.ab.ca/~mohrj/algorithms/checkdigit.html
<style>
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica}
span.s1 {color: #021da7}
span.s2 {color: #f9975e}
span.s3 {color: #ff9450}
span.s4 {color: #ab4500}
span.s5 {color: #a7a400}
table.sctid {border-width: 6px; border-color: #0080ff; border-collapse: collapse; border-style: ridge;}
td.sctid {border-width: 3px; border-color: #0080ff; border-collapse: collapse; padding: 6px; border-style: ridge;}
</style>
<form action="" name="form">
    <table class="sctid" border="1" width="441">
        <tr>
            <td class="sctid" width="212" height="25"> Partial Identifier <br/>(without check-digit)&nbsp; </td>
            <td class="sctid" width="115" height="25">
                <input name="num" size="18"/>
            </td>
            <td class="sctid" width="92" height="25">
                <input onclick="VerhoeffCompute()" type="button" value="Compute"/>
            </td>
        </tr>
        <tr>
            <td class="sctid" width="212" height="35"> SNOMED CT Identifier </td>
            <td class="sctid" width="115" height="35">
                <input name="numcd" size="18"/>
            </td>
            <td class="sctid" width="92" height="35">
                <input onclick="VerhoeffCheck()" type="button" value="Check"/>
            </td>
        </tr>
        <tr>
            <td class="sctid" width="212" height="23"> Result of check&nbsp; </td>
            <td class="sctid" width="115" height="23" colspan="2" id="out"> </td>
        </tr>
        <tr>
            <td class="sctid" width="212" height="23"> Component type </td>
            <td class="sctid" width="115" height="23" colspan="2" id="component"> </td>
        </tr>
        <tr>
            <td class="sctid" width="212" height="23"> Namespace </td>
            <td class="sctid" width="115" height="23" colspan="2" id="extnamespace"> </td>
        </tr>
    </table>
    <p style="margin-left: 0; margin-right: 0"> This Verhoeff checking part of this code was based
        on a webpage at: </p>
    <ul>
        <li>
            <a href="http://www.augustana.ab.ca/~mohrj/algorithms/checkdigit.html">
                http://www.augustana.ab.ca/~mohrj/algorithms/checkdigit.html </a>
        </li>
    </ul>
</form>

<script>
var FnF = new Array();
    FnF[0] = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
    FnF[1] = [1, 5, 7, 6, 2, 8, 3, 0, 9, 4]; 
    for ( var i = 2; i < 8; i++ ) 
    { 
        FnF[i] = [,,,,,,,,,];
        for ( var j = 0; j < 10; j++ ) 
        FnF[i][j] = FnF[i - 1][FnF[1][j]]; 
    } 
var Dihedral = new Array( 
   [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
   [1, 2, 3, 4, 0, 6, 7, 8, 9, 5], 
   [2, 3, 4, 0, 1, 7, 8, 9, 5, 6], 
   [3, 4, 0, 1, 2, 8, 9, 5, 6, 7], 
   [4, 0, 1, 2, 3, 9, 5, 6, 7, 8], 
   [5, 9, 8, 7, 6, 0, 4, 3, 2, 1], 
   [6, 5, 9, 8, 7, 1, 0, 4, 3, 2], 
   [7, 6, 5, 9, 8, 2, 1, 0, 4, 3], 
   [8, 7, 6, 5, 9, 3, 2, 1, 0, 4], 
   [9, 8, 7, 6, 5, 4, 3, 2, 1, 0] ); 
    
var InverseD5 = new Array(0, 4, 3, 2, 1, 5, 6, 7, 8, 9 ); 
    
function VerhoeffCheck()
    
    { 
    var check = 0; 
    var IdValue = document.form.numcd.value; 
    document.getElementById("out").innerText = "";
    document.getElementById("out").setAttribute("style","color:red;");
	document.getElementById("component").innerText ="Invalid partition";
	document.getElementById("component").setAttribute("style","color:green;");
	document.getElementById("extnamespace").innerText ="No namespace";
	document.getElementById("extnamespace").setAttribute("style","color:red;");

    for ( var i=IdValue.length-1; i >=0; i-- )  
    check = Dihedral[check][FnF[(IdValue.length-i-1) % 8][IdValue.charAt(i)]]; 
    if ( check != 0 ) { document.getElementById("out").innerText = "Check-digit ERROR"; }
    else if  (IdValue.length < 6) {document.getElementById("out").innerText = "SCTID too short";}
    else if  (IdValue.length > 18) {document.getElementById("out").innerText = "SCTID too long";}
	else {document.getElementById("out").innerText = "Check-digit OK";
	document.getElementById("out").setAttribute("style","color:green;");
	switch (IdValue.substr(IdValue.length-3,2))
	{
	case "00":
		document.getElementById("component").innerText ="Concept";
		document.getElementById("extnamespace").innerText ="International";
		break;
	case "01":
		document.getElementById("component").innerText ="Description";
		document.getElementById("extnamespace").innerText ="International";
		break;
	case "02":	
		document.getElementById("component").innerText ="Relationship";
		document.getElementById("extnamespace").innerText ="International";
		break;
	case "03":	
		document.getElementById("component").innerText ="Subset (RF1)";
		document.getElementById("extnamespace").innerText ="International";
		break;
	case "04":	
		document.getElementById("component").innerText ="Cross Map Set (RF1)";
		document.getElementById("extnamespace").innerText ="International";
		break;
	case "05":	
		document.getElementById("component").innerText ="Cross Map Target (RF1)";
		document.getElementById("extnamespace").innerText ="International";
		break;
	case "10":
		document.getElementById("component").innerText ="Concept";
		document.getElementById("extnamespace").innerText =IdValue.substr(IdValue.length-10,7);
		break;
	case "11":
		document.getElementById("component").innerText ="Description";
		document.getElementById("extnamespace").innerText =IdValue.substr(IdValue.length-10,7);
		break;
	case "12":	
		document.getElementById("component").innerText ="Relationship";
		document.getElementById("extnamespace").innerText =IdValue.substr(IdValue.length-10,7);
		break;
	case "13":	
		document.getElementById("component").innerText ="Subset (RF1)";
		document.getElementById("extnamespace").innerText =IdValue.substr(IdValue.length-10,7);
		break;
	case "14":	
		document.getElementById("component").innerText ="Cross Map Set (RF1)";
		document.getElementById("extnamespace").innerText =IdValue.substr(IdValue.length-10,7);
		break;
	case "15":	
		document.getElementById("component").innerText ="Cross Map Target (RF1)";
		document.getElementById("extnamespace").innerText =IdValue.substr(IdValue.length-10,7);
		break;
	default:
		document.getElementById("component").setAttribute("style","color:red;");					
	}
	if (document.getElementById("extnamespace").innerText=='International') {document.getElementById("extnamespace").setAttribute("style","color:green;");}
	else if (IdValue.length>10) {document.getElementById("extnamespace").setAttribute("style","color:green;");}
	else  {document.getElementById("extnamespace").innerText="Invalid Namespace";
	}
    } 
    }
function VerhoeffCompute( )
     
    { 
    var IdValue = document.form.num.value; var check = 0; 
    document.form.numcd.value= "";
    for ( var i = IdValue.length-1; i >=0; i-- )              
    check = Dihedral[check][FnF[(IdValue.length-i) % 8][IdValue.charAt(i)]]; 
    document.form.numcd.value = document.form.num.value + InverseD5[check];
    VerhoeffCheck();
    document.getElementById("out").innerText = "Computed check-digit";
	}
</script>
This Verhoeff checking part of this code was based on a webpage at:
http://www.augustana.ab.ca/~mohrj/algorithms/checkdigit.html
The source HTML and JavaScript code for this form is shown in Check-digit Computation.
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Last updated 7 days ago