Wiki Monochorionic vs Dichorionic Twin Placenta

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Our lab processes placentas frequently, and per Dennis Paget's handbook, if there is a clamp differentiating twin A from twin B on the umbilical cord(s), and if the diagnosis clearly states two separate dx for each placenta, then we can bill x2.
However, the discrepancy we're coming across is whether it matters that the placenta is monochorionic (meaning that the twins share one placenta) or dichorionic (meaning that there are two separate placentas - even if sometimes they are fused together).

For example, we have a case where there is a diamniotic, monochorionic twin placenta presented for pathology and the two cords are clamped and distinguished as twin A and twin B. Would this be billable as x1 or x2?
 
Twin Placentas

It seems that if the twins have separate placentas then it's billable as two separate diagnosis. So, if the twins share a placenta then it could only be billed as a single diagnosis. (Providing that billing is dependent on number of placentas);)
 
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