Miscellaneous ramblings
I'm in Pediatrics, so I really don't see Medicare (which is a shame because IL Medicaid only pays about 60% of Medicare) I would look forward to Medicare for all as a boost in income.
I unfortunately see the other side of medicine. Many of my parents are young and they have no clue of how to navigate the insurance system.

As a result often my patients have periods with NO insurance or Insane deductible insurance (>10-20% of the salary).
I see many late teens and twenties with no insurance because they have been dropped from Medicaid and have not obtained other coverage.
I have found that many of my parents make too much to qualify for Medicaid under "Obamacare" and won't pay hundreds of dollars for plans.

Can we really afford to have 15% of the population uninsured and probably another 20% underinsured?
The byzantine system system of copays/deductibles/coinsurance/coverage issues is absurd and changes from provider to provider. It's a shell game to make it difficult to get paid and aimed at not paying for care and denying care.
It doesn't have to be Medicare for all. It could be Blue Cross for all. The lack of paying administrative overhead for 400+ insurance companies would go a long way toward paying for those who are not insured.
But real medicine does not have a voice in congress, instead we have the AMA selling us out and making money off the CPT system.
The insurance companies are well represented. This is why they are are greater percentage of the medical dollar than primary care.

When you factor in Medicare, Medicaid, Obamacare subsidies, Tricare and the tax deductions on employer provided health care, the federal government pays most of the cost of health care anyway. Why do we have to fractionate it. I do understand that a single payor becomes a monopoly, but perhaps that will be better than the shell game we currently engage.