3d279c4a_2014_Medicare_Supplement_Plans__Benefit
[What Plan L Covers] Plan L covers 15% of the remaining costs after you pay the $147 Part B deductible [Benefit] 
Part B Coinsurance Without this benefit, you generally pay 20% of the Medicare-approved amount for Medicare Part B covered services and supplies (like doctor services and outpatient hospital care). This benefit will help you to reduce your out of pocket after Part B deductible.
Blue Cross Blue Shield of Illinois - 2014 Medicare Supplement Plans
Benefit