2012 Medicare Part B monthly premium rates that cover hospitals plus physician and outpatient expenses, are shown in the following table (by individual and joint filers) and reflect the 2012 COLA increase. The standard Medicare Part B monthly premium ($99.90) for existing beneficiaries reflects a $3.50 increase over the 2011 “harmless” premium of $96.40. New beneficiaries see the biggest saving in 2012 with a $15.50 decrease in the basic/standard premium from 2011 levels ($115.40). Social Security monthly payments in 2012 will also increase by 3.6%, which should be large enough on average to cover the increase in the Part B premium of $3.50 that most beneficiaries will experience.
Higher Income Earners: If a beneficiary’s “modified adjusted gross income” is greater than the legislated threshold amounts ($85,000 in 2012 for a beneficiary filing an individual income tax return or married and filing a separate return, and $170,000 for a beneficiary filing a joint tax return) the beneficiary is responsible for a larger portion of the estimated total cost of Part B benefit coverage. In addition to the standard Part B premium, affected beneficiaries must pay an income-related monthly adjustment amount.
Source : Medicare.gov