# text.div
Operation

# title
Validate that a coded value is in the code system.

# description
Validate that a coded value is in the code system. If the operation is not called at the instance level, one of the parameters "url" or "codeSystem" must be provided. The operation returns a result (true / false), an error message, and the recommended display for the code.

When invoking this operation, a client SHALL provide one (and only one) of the parameters (code+system, coding, or codeableConcept). Other parameters (including version and display) are optional.

# parameter[].documentation
Specifies the language to be used for description when validating the display property