As far as they don't accept National Accredited school; however, they do accept from National Accredited Institute that is evaluated by ACE. So, contact directly to Excelsior College is the best.
Actually, Excelsior will consider NA credit on a case-by-case basis, but you have to go through some sort of appeals process. I know there was another forum member here who went through the process, but he had a lot of credit that was not accepted.
Excelsior College has accepted ACE and DETC credit hours. As TEKMAN suggested last autumn it is highly recommended that you contact Excelsior College directly about transfer credits from ACSIC accredited schools. Give the school a telephone call on Monday and post their response here for the benefit of other students.