4.16.16 after 11.40am

I navigated to the right link to pay mass health, I've got my account number saved in notepad but I'm asked for an account type! There is one letter after numbers in my acct.# but that didn't work then I'm thinking it's a personal acct. try p and no luck! The good thing is I've run into this issue many times before and missed a month then paid double for the following month without a penalty! I'll try again later but this kind of crape frustrates this survivor BIG time!