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Definition: The first component contains the sequence of characters (the code) that uniquely identifies the item being referenced by the CNE.2. Different coding schemes will have different elements here.

Usage Note: The identifier is required and must be a valid code.

Definition: The second component contains the descriptive or textual name of the identifier, e.g., myocardial infarction or X-ray impression. This is the corresponding text assigned by the coding system to the identifier.

Usage Note: Text description of code is optional but its use should be encouraged since it makes messages easier to review for accuracy, especially during interface testing and debugging.

Definition: The third component contains the code for the name of the coding system from which the value in CNE.1 is obtained.Refer to HL7 Table 0396 - Coding Systems in Chapter 2C, Code Tables, for valid values. Each coding system is assigned a unique identifier.

As of v2.7 this component is required when CNE.1 is populated and CNE.14 is not populated. Both CNE.3 and CNE.14 may be populated. Receivers should not identify a code based on its position within the tuples (Identifier, Alternate Identifier, or Second Alternate Identifier) or position within a repeating field. Instead, the receiver should always examine the codingSystem as specified in CNE.3 and/or CNE.14 the Coding System component or the Coding System OID for the tuple.The combination of the identifier and name of coding system represent a unique concept for a data item.

Some organizations that publish code sets author more than one. The coding system, then, to be unique, is a concatenation of the name of the coding authority organization and the name of its code set or table. When an HL7 table is used for a CNE data type, the name of coding system component is defined as HL7nnnn where nnnn is the HL7 table number. Similarly, ISO tables will be named ISOnnnn, where nnnn is the ISO table number.

Usage Note: The following statement is retained for backward compatibility as of v2.7. Best practice would recommend that this component always be populated. However, if the field narrative explicitly states "Refer to HL7 Table nnnn for valid values”, and, if the sending and receiving systems are HL7 compliant, the coding system would be known from the standard. This would be similar to a field with an ID data type, except that there is a second triplet in which to express an alternate code.

Definition: A sequence of characters that uniquely identifies an alternate code. Analogous to CNE.1 Identifier.

Usage Notes: The Alternate Identifier is used to represent the local or user seen code as described. If present, it obeys the same rules of use and interpretation as described for component 1. If both are present, the identifiers in component 4 and component 1 should have exactly the same meaning, i.e., they should be exact synonyms.

Definition: The descriptive or textual name of the alternate identifier. Analogous to CNE.2 Text.

Usage Notes: If present, CNE.5 obeys the same rules of use and interpretation as described for CNE.2.

Definition: Identifies the coding scheme being used in the alternate identifier component. Analogous to CNE.3 Name of Coding System. Refer to HL7 Table 0396 - Coding Systems in Chapter 2C, Code Tables, for valid values.

As of v2.7 this component is required when CNE.4 is populated and CNE.17 is not populated. Both CNE.6 and CNE.17 may be populated. Receivers should not identify a code based on its position within the tuples (Identifier, Alternate Identifier, or Second Alternate Identifier) or position within a repeating field. Instead, the receiver should always examine the codingSystem as specified in CNE.6 and/or CNE.17, the "Coding System" component or the "Coding System OID", for the tuple.

Usage Notes: If present, CNE.6 obeys the same rules of use and interpretation as described for CNE.3.

Definition: the version ID for the coding system identified by CNE.3. It belongs conceptually to components 1-3 and appears here only for reasons of backward compatibility.

Usage Note: If the coding system is any system other than an "HL7 coding system," version ID must be valued with an actual version ID. If the coding system is "HL7 coding system," version ID may have an actual value or it may be absent. If version ID is absent, it will be interpreted to have the same value as the HL7 version number in the message header. Text description of code is optional but its use should be encouraged since it makes messages easier to review for accuracy, especially during interface testing and debugging.

Definition: the version ID for the coding system identified by CNE.6. It belongs conceptually to the group of Alternate components (see note 2.A.1) and appears here only for reasons of backward compatibility. Analogous to CNE.7 Coding System Version ID.

Usage Notes: If present, CNE.8 obeys the same rules of use and interpretation as described for CNE.7.

Definition: The text as seen and/or selected by the user who entered the data. Original text can be used in a structured user interface to capture what the user saw as a representation of the code on the data input screen, or in a situation where the user dictates or directly enters text, it is the text entered or uttered by the user. In a situation where the code is assigned sometime after the text was entered, original text is the text or phrase used as the basis for assigning the code.

Definition: A sequence of characters that uniquely identifies a second alternate code. Analogous to CN-1 Identifier.

Definition: The descriptive or textual name of the Second Alternate Identifier. Analogous to CNE.2 Text.

Definition: Identifies the coding scheme being used in the Second Alternate Identifier component. Analogous to CNE.3 Name of Coding System. Refer to HL7 Table 0396 - Coding Systems in Chapter 2C, Code Tables, for valid values.

As of v2.7 this component is required when CNE.10 is populated and CNE.20 is not populated. Both CNE.12 and CNE.20 may be populated. Receivers should not identify a code based on its position within the tuples (Identifier, Alternate Identifier, or Second Alternate Identifier) or position within a repeating field. Instead, the receiver should always examine the codingSystem as specified in CNE.12 and/or CNE.20, the "Coding System" component or the "Coding System OID", for the tuple.

Definition: This component carries the version for the coding system identified by components 10-12. Analogous to CNE.7 Coding System Version ID.

Definition: This component contains the ISO Object Identifier (OID) for the coding system or value set named in CNE.3. The value for this component is 2.16.840.1.113883.12.#### where "####" is to be replaced by the HL7 table number in the case of an HL7 defined or user defined table. For externally defined code systems the OID registered in the HL7 OID registry SHALL be used.

This component is required when CNE.1 is populated and CNE.3 is not populated. Both CNE.3 and CNE.14 may be populated.

Definition: This component contains the ISO Object Identifier (OID) to allow identification of the value set from which the value in CNE.1 is obtained. The value for this component is 2.16.840.1.113883.12.#### where "####" is to be replaced by the HL7 table number in the case of an HL7 defined or user defined table. For externally defined value sets, the OID registered in the HL7 OID registry SHALL be used.

A value set may or need not be present irrespective of other fields.

Definition: This component carries the version for the value set identified by CNE.15. The version is a date. The date is the date/time that the value set being used was published.

Value set version ID is required if CNE.15 is populated.

Definition: This component contains the ISO Object Identifier (OID) for the coding system or value set named in CNE.6. Analogous to CNE.14 OID for Coding System.

The value for this component is 2.16.840.1.113883.12.#### where "####" is to be replaced by the HL7 table number in the case of an HL7 defined or user defined table. For externally defined code systems the OID registered in the HL7 OID registry SHALL be used.

This component is required when CNE.4 is populated and CNE.6 is not populated. Both CNE.6 and CNE.17 may be populated.

Definition: This component contains the ISO Object Identifier (OID) to allow identification of the value set from which the value in CNE.4 is obtained. The value for this component is 2.16.840.1.113883.12.#### where "####" is to be replaced by the HL7 table number in the case of an HL7 defined or user defined table. For externally defined value sets, the OID registered in the HL7 OID registry SHALL be used.

A value set may or need not be present irrespective of other fields.

Definition: This component carries the version for the value set identified by CNE.18. The version is a date. The date is the date/time that the value set being used was published.

Value set version ID is required if CNE.18 is populated.

Definition: This component contains the ISO Object Identifier (OID) from which the value in CNE.12 is obtained. The value for this component is 2.16.840.1.113883.12.#### where "####" is to be replaced by the HL7 table number in the case of an HL7 defined or user defined table. For externally defined numbers, the OID registered in the HL7 OID registry should be used.

This component is required when CNE.4 is populated and neither CNE.6 nor CNE.18 is populated. In short either the CNE.6 or the CNE.14 or CNE.17 must be populated when CNE.4 is populated.

Definition: This component contains the ISO Object Identifier (OID) to allow identification of the value set from which the value in CNE.10 is obtained. The value for this component is 2.16.840.1.113883.12.#### where "####" is to be replaced by the HL7 table number in the case of an HL7 defined or user defined table. For externally defined value sets, the OID registered in the HL7 OID registry SHALL be used. A value set may or need not be present irrespective of other fields.

Definition: This component carries the version for the value set identified by CNE.21. The version is a date. The date is the date/time that the value set being used was published.

Value set version ID is required if CNE.21 is populated.