This code system http://terminology.hl7.org/CodeSystem/adverse-event-causality-assess defines the following codes:
\n \n \n \n \n \n Code\n \n | \n \n \n \n Display\n \n | \n \n \n \n Definition\n \n | \n \n
\n \n \n \n certain\n \n \n \n | \n \n Certain | \n \n i) Event or laboratory test abnormality, with plausible time relationship to drug intake; ii) Cannot be explained by disease or other drugs; iii) Response to withdrawal plausible (pharmacologically, pathologically); iv) Event definitive pharmacologically or phenomenologically (i.e. an objective and specific medical disorder or a recognized pharmacological phenomenon); or v) Re-challenge satisfactory, if necessary. | \n \n
\n \n \n \n probably-likely\n \n \n \n | \n \n Probably/Likely | \n \n i) Event or laboratory test abnormality, with reasonable time relationship to drug intake; ii) Unlikely to be attributed to disease or other drugs; iii) Response to withdrawal clinically reasonable; or iv) Re-challenge not required. | \n \n
\n \n \n \n possible\n \n \n \n | \n \n Possible | \n \n i) Event or laboratory test abnormality, with reasonable time relationship to drug intake; ii) Could also be explained by disease or other drugs; or iii) Information on drug withdrawal may be lacking or unclear. | \n \n
\n \n \n \n unlikely\n \n \n \n | \n \n Unlikely | \n \n i) Event or laboratory test abnormality, with a time to drug intake that makes a relationship improbable (but not impossible); or ii) Disease or other drugs provide plausible explanations. | \n \n
\n \n \n \n conditional-classified\n \n \n \n | \n \n Conditional/Classified | \n \n i) Event or laboratory test abnormality; ii) More data for proper assessment needed; or iii) Additional data under examination. | \n \n
\n \n \n \n unassessable-unclassifiable\n \n \n \n | \n \n Unassessable/Unclassifiable | \n \n i) Report suggesting an adverse reaction; ii) Cannot be judged because information is insufficient or contradictory; or iii) Data cannot be supplemented or verified. | \n \n
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