When to use Postprocedural Cardiac Arrest?

When to use postprocedural cardiac arrest?  Does the provider have to link the cardiac arrest to the actual procedure to be considered post-procedural?  Is there a timeframe to be considered "postprocedural"?  If this happened immediately post op, can we use the post procedural code?

Patient admitted with cardiac arrest status post CABG three weeks ago.  Patient expired.  Provider documented "cardiac arrest due to underlying cardiac condition" which is not a valid PDx.  Query for etiology of cardiac arrest was answered as "unable to be determined".

In pre-bill review: It is currently coded as post-procedural cardiac arrest.  Should it just be cardiac arrest, unexplained?

Please post any references you have that will help. 

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