Many Medicare recipients should be prepared to pay more for their doctor's visits and other outpatient care next year.

For the 70 percent of Medicare Part B enrollees who currently pay a lower monthly premium due to a "hold harmless" legal provision, their monthly cost will rise by as much as $25 to $134, from the 2017 average of $109, according to information released Friday by the Centers for Medicare and Medicaid.

The standard monthly premium for Part B will remain unchanged at $134.

The hold harmless provision prevents Medicare Part B premiums from rising more than a person's Social Security cost-of-living adjustment, or COLA. After several years of low or no annual COLAs, Social Security recipients will get a 2 percent COLA increase next year.