The CMS announced it will increase Medicare Part B premiums about 6.7% for most enrollees in 2020. The 2020 increase is up from an increase of 1.1% in 2019, and up from no increase in 2018. The annual Part B deductible will increase by 7%, to $198. The Social Security Administration recently announced the 2020 Social Security COLA will be 1.6%. That means the size of the 2020 COLA will be much smaller than the 2020 increase in Part B premiums.