diff --git a/CSharp8583/CSharp8583/Common/Enumerations.cs b/CSharp8583/CSharp8583/Common/Enumerations.cs
index b2e4682..3b0a561 100644
--- a/CSharp8583/CSharp8583/Common/Enumerations.cs
+++ b/CSharp8583/CSharp8583/Common/Enumerations.cs
@@ -127,6 +127,10 @@ public enum LengthType
         /// </summary>
         LLLLVAR = 4,
         /// <summary>
+        /// LLLLLVAR binary field of up to 99999 bits in length
+        /// </summary>
+        LLLLLVAR = 5
+        /// <summary>
         /// LLLLLLVAR binary field of up to 999999 bits in length
         /// </summary>
         LLLLLLVAR = 6
diff --git a/CSharp8583/CSharp8583/Extensions/IsoExtensions.cs b/CSharp8583/CSharp8583/Extensions/IsoExtensions.cs
index 89813a1..5918b49 100644
--- a/CSharp8583/CSharp8583/Extensions/IsoExtensions.cs
+++ b/CSharp8583/CSharp8583/Extensions/IsoExtensions.cs
@@ -126,6 +126,7 @@ internal static string GetFieldValue(this IIsoFieldProperties isoFieldProperties
                     case LengthType.LLVAR:
                     case LengthType.LLLVAR:
                     case LengthType.LLLLVAR:
+                    case LengthType.LLLLLVAR:
                     case LengthType.LLLLLLVAR:
                         if (isoFieldProperties.LenDataType == DataType.ASCII)
                         {
@@ -207,6 +208,7 @@ internal static byte[] BuildFieldValue(this IIsoFieldProperties isoFieldProperti
                     case LengthType.LLVAR:
                     case LengthType.LLLVAR:
                     case LengthType.LLLLVAR:
+                    case LengthType.LLLLLVAR:
                     case LengthType.LLLLLLVAR:
                         if (isoFieldProperties.LenDataType == DataType.ASCII)
                         {