If you have a bill for a visit after June 30, 2019, you can pay your bill online in MyCHArt. If you don't have a MyCHArt account, you can sign in as a guest.
I have a MyCHArt account: MyCHArt Login
Sign in as a guest: Guest log-in
Note: For guest sign-in, you will need the Guarantor ID code on your statement and your name.