In regards to the Medicare adjustment, selling a house is NOT one of the situations that qualify for it.  Sure, it is possible you could get someone to process it incorrectly, but a large increase of income is NOT a qualifying event.   A loss of job income (selling the practice for George) is a qualifying event.  

From the link above:

There are 7 qualifying life-changing events:

• Death of spouse
• Marriage
• Divorce or annulment
• Work reduction
• Work stoppage
• Loss of income from income producing property
• Loss or reduction of certain kinds of pension income