Some recent ones I enjoyed:
Temple Alley Summer, by Sachiko Kashiwaba. (translated by Avery Fischer Udagawa). Hm...I guess technically there IS a fatal disease, but it happened in the past to someone who is now a ghost, so I would not say it's the type that fits teary afternoon specials of the 1980s. It won an award this year at ALA (for translated work, I believe). Japanese story that is highly original.
Deadman’s Castle, by Ian Lawrence. I just have always liked his voice--it sounds like a real person telling you something that really happened (no matter if it's truly possible or not). About a kid whose dad keeps moving them around for witness protection...but is that really the case?
The Stolen Prince of Cloudburst, by Jaclyn Moriarty. Moriarty has a very unique voice as well, and you think that it's all a bunch of random stuff until all of a sudden, everything connects, and you are totally awake and riveted. MG fantasy (the kind that is perfectly modern day, but with magic added).
The In-Between, by Rebecca K.S. Ansari. I don't know why I keep picking up MG ghost story books! But this is another one.
The Myrtle series by Elizabeth C. Bunce, starting with Premeditated Myrtle. Victorian MG mysteries.
A Wish in the Dark, by Christina Soontornvat. A Thai-inspired fantasy. I loved it.
