OB billing 59430

Hello :)
I am very new to OB billing and although I am getting a better understanding I have read a lot about the 59430 code. The providers I am working for have just left a practice and have started their own Private Practice. With that said they had 2 ladies that delivered close to the date of separation so we are only billing for the PP care. I understand that it is a six week period. If they come in more that one time for a PP visit with-in the 6 weeks can I bill that code more than once? Or can they come in as many times as needed during the six weeks and it is just billed once.

Thank you