My wife is on my health insurance from work. Does she still have to pay for part "B"?

Hi. If your wife is enrolled in Part B of Medicare then yes she'd have to pay the premiums even if her primary coverage is from your employer plan. If your wife hasn't enrolled in Part B and if she's covered under your plan and if the plan covers at least 20 employees, then she could likely wait to sign up for Part B until you retire without being required to pay a penalty for late enrollment. For more detailed information, refer to the following Medicare website: https://www.medicare.gov/sign-up-change-plans/how-do-i-get-parts-a-b/sho....

Best, Jerry