Difference between O20.9 & O46.91.( Bleeding in early pregnancy)

Hi All,
I am not able to make out what is difference between O20.9 & O46.91 in ICD 10 CM.

O20.9 Hemorrhage in early pregnancy, unspecified.
O46.91 Antepartum hemorrhage first trimester.

Please clarify on that.:confused:

Regards

Manish Kumar

CPC

Difference between O20.9 & O46.91.( Bleeding in early pregnancy)