OBGYN - gestational age Z codes

Does anyone know if the gestational age Z codes are listed last on a claim. For example, say a patient had a normal vaginal delivery of a single liveborn at 39 weeks. Would you code the DXs as O80, Z39.0, Z3A.39 or O80, Z3A.39, Z39.0?

I can't find anything in the guidelines specifying if the gestational code goes last or not...only that it is an additional code.

Thanks in advance for any help!

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OBGYN - gestational age Z codes