I was recently looking for a inclusive list of covered expenses and found that there is no answer carved in stone apparently. What I did find is that generally, expenses covered are the same as for medical expenses allowed as defined by IRS publication 502. Try the web site:
http://www/irs.gov/prod/forms_pubs/pubs/p50207.htm
Look under the medical expenses, section referring to schools and education. You may also ask the TPA of your HCRA for a list of covered expenses. If they refer to this IRS document, it is apparently covered.