When Medicare crosswalks the claim to the supplemental (and they don't always, check your Medicare EOB to see) they have all the figures on the crosswalked claim.
Please note that supplemental covers deductible and co-pay only for the items that Medicare allowed. A true secondary MAY cover items not allowed by Medicare, and may pay higher rates. A true secondary is different from a supplemental. Although true secondary insurance is seen less and less every year.