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Base Code Systems


Reasons that a value associated with a test or other observation is missing.

Code Display
missing_unanswered The source was asked but declined to respond to the question, or the question was left unanswered.
missing_na The question or data element is not applicable, or based on other answers, no answer to this question is required.
missing_redacted The information has been redacted.
missing_no_clue The reason the information is not present is not known.
missing_cancelled The request or order to collect this information was cancelled.
missing_collection Missing due to a problem collecting, identifying, or locating the specimen, including patient refusal or unable to provide specimen
missing_specimen Missing due to a problem with the specimen, e.g. contamination, clotting, improper tube type, improper storage, too small, etc.
missing_malfunction Missing due to instrument malfunction.


Description TBD

Code Display
dont_know_answer The source responded that he or she did not know the information needed or requested.
exists_answer The source asserts that the thing in question exists, but additional information is unknown. For example, Jim knows he has a dentist, but not recall her name.
none_answer Nothing of a type of thing is known to exists, e.g., the siblings of an only child. Also use this code to represent a 'none of the above' answer