In terms of Medicaid expansion and eligibility, the ACA has allowed for the expansion of Medicaid to those with low incomes and below the poverty line. It is said in the HIV.gov website, that today, Medicaid is the largest payer for HIV in the U.S. This is a fact I was surprised about, because you do not hear to much, publicly at least, about HIV and those who are affected still. "In states that opt for Medicaid expansion, people living with HIV who meet the income threshold will no longer have to wait for an AIDS diagnosis in order to become eligible for Medicaid. That means they can get into life-extending care and treatment before the disease has significantly damaged their immune system" (The Affordable Care Act and HIV/AIDS). This is a great expansion that the ACA is allowing because it can help so many suffering AIDS victims. However, the population under the poverty line do not benefit from this. There is only so much Medicaid can fund, and if people cannot pay for needs such as blood tests and other testing, it will be hard for them to receive the care they need to stay alive.
Overall, the ACA has definitely been a huge contributor to the HIV/AIDS community. It has given ample opportunities for coverage that was not given to the sick in the 80's. The ACA is able to give people of the proper income the treatment they need in order to become healthy and live a normal life as best they can.

https://www.hiv.gov/federal-response/policies-issues/the-affordable-care-act-and-hiv-aids