How do I locate the diagnosis code for migraine headache?

How do I locate the diagnosis code for migraine headache?
The diagnosis code for headache is 784.0 and the diagnosis code for migraine is 346.X (X depends on specifics of the migraine, but this diagnosis needs a 4th digit). I am confused on if there is even a combined diagnosis code for “Migraine headache” or if I would have to list both. I would think there would be a combined code, but this is the only diagnosis code I am questioning in my work book. Please help if you know. Thank you!

There are losts of good answers, but the best answer:

Answer by pelican
The information at these pharmacys might help. They reference the different codes for migraines.

http://www.icd9data.com/2010/Volume1/320-389/340-349/346/346.0.htm
http://www.icd9data.com/2010/Volume1/320-389/340-349/346/default.htm#346.0

What do you think? Answer below!