You should also check out what the medical requirements are to qualify for any support services. Even if your parent qualifies for Medicaid different states also have different levels of health (I.e how bad their health has to be) to qualify for something like home aide support, if it is even an option.
You should look at the district and each county in
MD that you are considering’s area agency on aging website (service can vary from county to county).
Another program you can look at is PACE. One is about to open in SE DC and there is also one in Baltimore (run by John’s Hopkins). I think MD is also in the process of opening more. To qualify, your parent would have to live in the program service area, qualify for Medicaid, and also be considered requiring nursing home level of support (the program is an alternative to a nursing home).
Good luck!