Postpartum only 59430

I have a family practice physician in a hospital owned clinic who does ob/gyn care. He saw a patient 4 weeks after her c-section, and wants to code 59430 in addition to 99213. He did not perform the delivery. Is that allowed ever? If so, please help me find a link to the information stating that so that I can justify coding it that way.
Thanks in advance for your help.

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