A medical bill is read as the cost that follows care. Tradition links it to worry about what healing or help will demand of you, and to the weight of obligations after a hard time.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.