If Medicare Part A covers a blood test for an inpatient, the cost of the testing becomes part of the overall covered hospital charges. Medicare Part A payment for inpatient hospital charges is subject to a deductible and to daily co-payments for stays of 60 days or more.ut sometimes a Part C plan covers more, with extra services or an expanded amount of coverage. (Co-payments for Part C plans may also be different than those for Part A or Part B.) To find out whether your plan provides extra coverage or requires different co-payments for blood tests, contact the plan directly.