58558 has a zero global period, so an e/m can be reported for follow up to that procedure. 58662 has a 90 day global so you cannot report an e/m for follow up.
The ua would still be inclusive of the OB visit regardless of abnormality. However if the abnormality requires a significant separately identifiable e/m, an e/m can be reported outside of the global. Some payors require modifier -25 for an e/m outside of the OB global.
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