My uncle has been diagnosed with Colon Cancer, however, due to a misunderstanding with SSN dept, he just starting receiving coverage for Medicare Part A, but was told Medicare Part B would not take effect until July 2016. He is over the age of 65. He will need to go to see an oncologist and may need surgery to remove the mass, with additional tests. However, my understanding is Medicare Part A will not cover this unless he is admitted to a Hospital. My question is would he able to qualify/received Obamacare Coverage to cover these additional expenses. If so, would needs to be done to receive Obamacare Coverage ASAP.
If you have Medicare you cannot use ObamaCare's Marketplace or buy non-Medicare insurance, even if you only have Part A or Part B. Anyone who has access to Medicare must choose from Original Medicare and supplemental Medicare options. It is illegal for private companies (inside or outside the Health Insurance Marketplace) to sell non-Medicare plans to Medicare eligible Americans.
The above being said, those who aren't eligible for Medicare can get cost assistance through ObamaCare or a private plan regardless of age.
If you need better Medicare coverage and you are outside your Medicare enrollment period your best bet would be to call Medicare.Gov (1-800 MEDICARE) and ask them what options you have.
You can learn more about ObamaCare and Medicare here.