# description
A code that describes the type of issue.

# concept[].definition
Content invalid against the specification or a profile.

# concept[].concept[].definition
A structural issue in the content such as wrong namespace, unable to parse the content completely, invalid syntax, etc.

# concept[].concept[].definition
A content validation rule failed - e.g. a schematron rule.

# concept[].concept[].definition
The client needs to initiate an authentication process.

# concept[].concept[].definition
The user or system was not able to be authenticated (either there is no process, or the proferred token is unacceptable).

# concept[].concept[].definition
User session expired; a login may be required.

# concept[].concept[].definition
The user does not have the rights to perform this action.

# concept[].concept[].definition
Some information was not or might not have been returned due to business rules, consent or privacy rules, or access permission constraints.  This information may be accessible through alternate processes.

# concept[].definition
Processing issues. These are expected to be final e.g. there is no point resubmitting the same content unchanged.

# concept[].concept[].definition
The interaction, operation, resource or profile is not supported.

# concept[].concept[].definition
An attempt was made to create a duplicate record.

# concept[].concept[].definition
Multiple matching records were found when the operation required only one match.

# concept[].concept[].definition
The reference provided was not found. In a pure RESTful environment, this would be an HTTP 404 error, but this code may be used where the content is not found further into the application architecture.

# concept[].concept[].concept[].definition
The reference pointed to content (usually a resource) that has been deleted.

# concept[].concept[].definition
Provided content is too long (typically, this is a denial of service protection type of error).

# concept[].concept[].definition
The code or system could not be understood, or it was not valid in the context of a particular ValueSet.code.

# concept[].concept[].definition
An extension was found that was not acceptable, could not be resolved, or a modifierExtension was not recognized.

# concept[].concept[].definition
The operation was stopped to protect server resources; e.g. a request for a value set expansion on all of SNOMED CT.

# concept[].concept[].definition
The content/operation failed to pass some business rule and so could not proceed.

# concept[].concept[].definition
Content could not be accepted because of an edit conflict (i.e. version aware updates). (In a pure RESTful environment, this would be an HTTP 409 error, but this code may be used where the conflict is discovered further into the application architecture.).

# concept[].definition
Transient processing issues. The system receiving the message may be able to resubmit the same content once an underlying issue is resolved.

# concept[].concept[].definition
A resource/record locking failure (usually in an underlying database).

# concept[].concept[].definition
The persistent store is unavailable; e.g. the database is down for maintenance or similar action, and the interaction or operation cannot be processed.

# concept[].concept[].definition
An unexpected internal error has occurred.

# concept[].concept[].definition
Not all data sources typically accessed could be reached or responded in time, so the returned information might not be complete (applies to search interactions and some operations).

# concept[].concept[].definition
The system is not prepared to handle this request due to load management.

# concept[].definition
A message unrelated to the processing success of the completed operation (examples of the latter include things like reminders of password expiry, system maintenance times, etc.).